PLEASE NOTE:
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CATASTROPHES: THE DILUVIAL EVIDENCE
by Trevor Palmer, Nottingham Trent University, UK
Paper presented at the SIS Silver Jubilee conference at
Easthamstead
Park, 19 September 1999
Summary
Flood myths are found throughout the world. As late as the
seventeenth
century, one particular flood myth, that involving Noah, was
regarded
as the literal truth by almost everyone in Europe. In contrast,
for
most of the twentieth century, very few scientists have been
prepared
to even consider the possibility that floods or other
catastrophes may
have occurred on a global scale. Now that we can examine the
evidence
with greater objectivity, it is abundantly clear that, although
the
continents have not been covered by water during the time that
humankind has lived on the Earth, there have nevertheless been
some
large-scale catastrophic floods. Two periods of particular
interest
from this point of view are the Pleistocene-Holocene transition
and the
beginning of the Late Holocene. Many questions still remain
unanswered
about the events at these times.
The Ancient World
According to the book of Genesis, God breathed life into Adam and
Eve,
the first man and woman, on the sixth day of Creation. Just nine
generations later, corruption had become so widespread that God
brought
about the Flood, when "the waters prevailed upon the earth
an hundred
and fifty days", and "all the high hills, that were
under the whole
heaven, were covered." However, Noah, who was an exception
to the
general rule of wickedness, had been warned about the coming
deluge.
This enabled his family to build a large boat, the Ark, on which
to
sail on the waters. Hence they survived the Flood, the only
humans to
do so [1].
The story of Noah is just one of over 500 flood myths from around
the
world, many of which similarly involve a man and a woman escaping
by
boat. Amongst these is the one told in the Babylonian epic of
Gilgamesh, where the hero, Uta-Napishtim, was warned by Ea, God
of the
Waters, about the coming deluge. Others include a Greek myth,
where the
survivors were Deucalion and his wife, Pyrrha [2].
As well as legends of a catastrophic flood, there are other
widespread
myths where the Earth suffered near destruction by fire. An
example is
one from Greece in which Phaeton took the Sun-chariot and drove
it too
close to the Earth, scorching the surface, until Zeus cast a
thunderbolt and caused Phaeton to fall to his death. According to
the
philosopher, Plato (c429-347 B.C.), the basis of the Phaeton myth
was
one of a series of cosmic disturbances which caused periodic
catastrophes on Earth [3].
The origins of myth and legend are far from certain, and may not
be the
same in every case. Hence, it remains possible that some stories
may,
to a greater or lesser extent, have a factual basis. Indeed, from
locations described by Homer, archaeologists such as Heinrich
Schliemann and Wilhelm Dörpfeld have found extensive evidence of
pre-classical civilisations [4,5].
In most ancient traditions, catastrophes were associated with
divine
displeasure. In Genesis, as we have seen, God caused Noah's Flood
because of the increasingly wicked behaviour of humankind.
Similarly,
in Greek mythology, Zeus regularly killed people with
thunderbolts, as
in the Phaeton myth, whilst Poseidon was inclined to cause great
storms
or floods when annoyed [2,5].
Such floods had undoubtedly occurred. By the time of Aristotle
(384-322
B.C.), the evidence of marine fossils in outcrops of rock made it
clear
that at least part of what was now land had once been covered by
sea.
In his Meteorologica, Aristotle wrote that there were periodic
transpositions of land and sea, but generally those occurred too
slowly
and over too long a time interval for anyone to notice them
happening.
Nevertheless, on rare occasions a great winter could occur,
bringing
protracted heavy rainfall and causing devastating floods, such as
that
of Deucalion [6,7].
Renaissance and Restoration Times
When Christianity was established in Europe, the Church exercised
almost complete control over academic thought for many centuries.
At
this time, it would have been heretical to deny the testimony of
the
Bible, that the Earth was only a few thousand years old, having
been
created around 4004 B.C., and that there had been a single major
cataclysm, the Deluge in the time of Noah. In the early sixteenth
century it was still generally accepted that all marine fossils
found
inland had been carried there by Noah's Flood, although Leonardo
da
Vinci and others argued that this was impossible, in view of the
transient nature of the supposed event and the thickness of the
fossil
beds. The land must have risen in places, changing the shoreline
in
significant fashion, just as Aristotle had suggested [7].
During the seventeenth and eighteenth centuries, various theories
of
the formation and development of the Earth were put forward by
men who
were known as cosmogonists. In 1669, the Danish naturalist,
Nicolaus
Steno (1638-1686) produced a theory to explain the landscape of
Tuscany
in which the Flood played a prominent but far from unique role.
Other
features included the elevation of land in some locations because
of
precipitation of sediments from the waters, and its lowering
elsewhere
as a consequence of the collapse of caverns under the ground
[7,8].
Later, several English cosmogonists put forward models which
tried to
reconcile observations with the teachings of the Church. The
system of
Thomas Burnet (1635-1715), dating from the 1680s, had some
features in
common with that of Steno, but instead of relying on rain and
subsidence to cause the Flood, it suggested that the appearance
of wide
cracks in the Earth's surface allowed water to be forced upwards
from
underground stores. As was inevitable in the seventeenth century,
Burnet started with the assumption that the Biblical record was
essentially true, and then sought natural explanations for the
events
described. He was not prepared to accept that the waters causing
the
Flood had been created miraculously by God. However, they must
have
come from somewhere, so the interior of the Earth seemed the most
likely possibility [7-9].
William Whiston (1666-1753) who succeeded Isaac Newton in the
chair of
mathematics at Cambridge University, agreed partially with
Burnet. He
thought that some of the waters of the Flood might have been
released
from the interior of the Earth, but he considered that the major
proportion had fallen as rain derived from the vapours in the
tail of a
passing comet. These ideas were presented in a book published in
1696.
Whiston was aware that comets moved about the Sun in elliptical
orbits
of high eccentricity, because John Flamsteed, the Astronomer
Royal, had
made detailed observations of the comet of 1680. Also, Edmond
Halley
had deduced that the comet of 1682 (which subsequently took his
name)
had the same orbit as those of 1531 and 1607, and predicted,
correctly
as it turned out, that it would return in 1758. He was less
accurate in
his calculations of the periodicity of the 1680 comet, but these
led
Whiston to believe that it could have made an earlier visit in
2342
B.C., around the time the Flood was thought to have occurred, on
the
basis of internal evidence from the Bible [7,10].
Whiston was eventually dismissed from his post for, amongst other
reasons, indicating that global catastrophes, past and future,
might be
caused by natural phenomena. Halley was similarly censured for
suggesting to the Royal Society of London in 1694 that the story
of
Noah's flood might be an account of a cometary impact [11-13].
Meanwhile, on the continent of Europe, the German mathematician
and
philosopher, Baron Gottfried von Leibniz (1646-1716), believed
that the
Earth was formed by condensation of cosmic matter, so it would
initially have been very hot, and hence in a fluid-like state. He
proposed that, as it cooled, a crust formed which later cracked
on
occasions to release flood water from within the Earth, each time
depositing a layer of sediment [14].
The French naturalist, Georges-Louis Leclerc, Comte de Buffon
(1708-1788) suggested that the "days" of creation in
Genesis were not
meant to be taken literally. It made more sense, he thought, to
regard
them as periods of unspecified but great length. Buffon
calculated that
if, as he personally supposed, the Earth had been formed by a
collision
between the Sun and a comet, it could have cooled down
sufficiently
within 35,000 years to allow condensation of atmospheric water
vapour
to form a universal ocean. Further cooling over many thousands of
years
caused cavities to appear in the Earth's surface, through which
sea
water drained until it reached its present level. As volcanoes
began to
erupt, the continents appeared and valleys were gouged out by
ocean
currents [7,14].
Buffon's contemporary, Benoit de Maillet, believed that erosion
of the
earliest mountains by the action of the ocean over a timescale of
millions of years was an important factor in producing sediment
from
which new mountains could be made [7,12].
Theories that a universal ocean once contained in solution all
the
material that later formed the Earth's crust were generally
labelled as
"Neptunist". In contrast, the "Plutonist"
theory of James Hutton
(1726-1797) maintained that some rocks, such as granite, were not
sedimentary, but had been produced by volcanic action. That view
eventually prevailed but, to start with, Neptunism was the more
popular
theory. The most influential advocate of Neptunist views was
Abraham
Gottlob Werner (1749-1817), a German geologist. In Werner's
theory,
precipitation of dissolved material took place over long periods
of
time, first forming primitive rocks such as granite, and then, as
erosion of these began to contribute to the process, deposits
such as
limestones and slates. Later, when mechanical deposition became
more
significant than chemical precipitation, came the laying down of
chalk
and other fossil-rich rocks [9,14,15].
As field evidence accumulated, various British cosmogonists
produced
theories which attempted to be consistent with the new findings,
yet
retain a place for Noah's flood. By the end of the eighteenth
century
it was clear that, even if the Flood had occurred, it could only
have
been one of many factors responsible for the formation of
features at
the Earth's surface [7].
In France, Buffon, remained the dominant figure right up to his
death
in 1788. However, a new generation of naturalists was emerging,
and
these sought a fresh approach to science. One of the chief
critics of
Buffon's style was Georges Cuvier (1769-1832) [14,16].
Nineteenth Century Catastrophists
Although most pre-nineteenth century cosmogonists, including
Buffon,
used rational methods, their arguments were often speculative and
philosophical. In contrast, one of Cuvier's guiding principles
was to
avoid unwarranted speculation. After Buffon's death, Cuvier
quickly
established a reputation as a gifted scientist, particularly in
the
field of comparative anatomy. In 1812, he published the results
of a
detailed investigation of the geology of the Paris basin, carried
out
over many years in collaboration with the mining engineer and
mineralogist, Alexandre Brongniart. It seemed clear to Cuvier
that
there had been several sudden advances and retreats of the sea.
Alternating layers of saltwater and freshwater deposits rested on
a
thick bed of chalk, whilst overlying the stratified rocks in
valley
bottoms was a layer of loose material which he termed
"detrital silt".
The changes between successive periods of rock formation were
linked to
major catastrophes (which Cuvier called révolutions) for, on
each
occasion, almost all the animals and plants then living were
annihilated. In the aftermath, new types emerged, according to
the
evidence of the fossils found in the rocks. The scale was such
that the
processes involved must have affected an area far greater than
just the
Paris basin, perhaps even covering the whole world. As an
indication of
the speed of action of the most recent of the révolutions, if
not the
others, Cuvier drew attention to the discovery of unputrified
carcasses
of large extinct mammals such as mammoths, in frozen lands to the
north, reports of which had reached Paris in 1807. Later, in
1829,
Léonce Élie de Beaumont (1798-1874) suggested a possible
mechanism for
the révolutions, arguing that even if the Earth was cooling
slowly and
gradually as Buffon had proposed, and that the reduction in
volume led
to mountain building, then this latter process was still likely
to
occur in an episodic and catastrophic fashion, with upheavals of
submerged land [16-18].
Cuvier took great care to keep his science and religion separate.
In
Britain during the same period, such an attitude would have been
most
unusual, for many professional scientists were clergymen. Indeed,
this
was still a requirement for obtaining a senior post at either
Oxford or
Cambridge Universities. So, for example, at Cambridge, the Rev.
Adam
Sedgwick was Professor of Geology, whilst at Oxford, the Rev.
William
Buckland was Reader in the same subject. Buckland and Sedgwick
were
keen to operate as true scientists, independent of the Church.
However,
as a consequence of their background, they began with an
assumption
that fieldwork would rapidly confirm the essential features of
the
Genesis account [16,18,19].
Early in his career, Buckland interpreted a widespread layer of
loam
and gravel, corresponding to Cuvier's "detrital silt",
as the product
of the universal deluge in the time of Noah. He was concerned
that the
immense depths of deposits beneath this layer suggested that the
Earth
must be very old, with Creation taking far longer than the six
days
mentioned in the Bible. Nevertheless, the evidence for the deluge
itself seemed clear enough. Fossils found in mud deposits in
caves
throughout Europe must have been of animals trapped by the rising
flood
water. During his inauguration as Reader in 1819, Buckland
argued, "The
grand fact of a universal deluge at no very remote period is
proved on
grounds so decisive and incontrovertible, that had we never heard
of
such an event from Scripture or any other authority, Geology of
itself
must have called in the assistance of some such catastrophe"
[15,18,20].
The case was presented in detail in his Relics of the Flood,
published
in 1823. Without question, this book avoided speculation,
concentrating
instead on empirical evidence which seemed to show that a single,
major
flood had taken place. At the time, Sedgwick supported Buckland's
views. However, it soon became apparent that the loam and gravel
layer
was restricted to northern latitudes, so was not universal. Also,
further investigation showed that the fossils in the various
caves did
not all come from the same period. Buckland announced in 1836
that he
no longer believed in a single, universal flood. Five years
earlier,
Sedgwick had done the same during an address to the Geological
Society
of London. Admitting that he and his colleagues had been led
astray by
their expectation of finding evidence of Noah's flood, Sedgwick
said,
"There is, I think, one great negative conclusion now
incontestably
established - that the vast masses of diluvial gravel, scattered
almost
over the surface of the earth, do not belong to one violent and
transitory period" [15,18,20]
However, although Buckland, Sedgwick and others came to reject
the idea
of a single Flood, they continued to find the evidence strongly
suggestive of the involvement of cataclysmic forces. It was just
that
these had acted on more than one occasion, just as Cuvier had
concluded. All the geologists were impressed by the large erratic
boulders (i.e. ones foreign to the region) found scattered over
much of
Europe and North America, and by the loam and gravel deposits
which lay
as a mantle in northern regions. In an attempt to explain the
origin of
these features, theories of tidal waves were developed from the
"cooling Earth" scenario of Élie de Beaumont
[15,18,20].
Nevertheless, only a few years later, catastrophic diluvialism
was a
spent force. This was because Charles Lyell (1797-1875)
established
what he termed the "uniformitarian" view that the only
significant
processes bringing about changes to the Earth's surface were
ordinary,
everyday ones, acting gently but persistently over very long
periods of
time. Also, it became accepted, largely because of the work of
Louis
Agassiz (1807-1873), a Swiss naturalist and catastrophist, who
moved to
the United States in 1846, that the erratic boulders and drift
deposits
had been carried by glaciers during an `Ice Age', not by tidal
waves
[15,18,21].
The concept of Ice Ages became a part of the uniformitarian
consensus,
on the assumption that the environmental changes associated with
them
occurred in a gradual fashion. Lyell's uniformitarianism, which
was
gradualism by another name, ruled without serious challenge for a
century or more [9,15,18].
Twentieth Century Catastrophists
Possible catastrophist scenarios, often speculative in nature,
continued to be put forward, to little effect. For example, Hugh
Auchincloss Brown (1879-1975), an engineer who graduated from
Columbia
University, proposed in a private publication of 1948 that the
tilt of
the Earth's axis could change in catastrophic fashion, the
disturbances
being triggered by the weight of polar ice. Ten years later,
Charles
Hapgood, a science historian from Keene State College, New
Hampshire,
began to argue for a similar theory, in which only the crust
moved, not
the whole Earth. However, these ideas, whether they were right or
wrong, made little impression on orthodox scientific thought
[7,22].
Scenarios based on extraterrestrial impacts fared no better. That
was
hardly surprising, given that the starting point in many cases
was the
assumption that some myths and legends were based on catastrophes
of
cosmic origin, which was not regarded as a serious possibility by
University-based academics. One of those who interpreted a myth
as an
actual event was the Jesuit scholar, Franz Xavier Kugler
(1862-1929).
Using several ancient sources, Kugler argued in 1927 that Phaeton
was a
very bright object which had appeared in the sky several hundred
years
before the founding of Rome, eventually falling to Earth as a
shower of
large meteorites, causing catastrophic fires and floods,
particularly
in Africa [11,23].
Another catastrophist of the period was the British journalist,
Comyns
Beaumont, who argued in a 1932 book that comets were planets
which had
been displaced from their natural orbits. According to Beaumont,
cometary heads tended to disintegrate, forming meteors, which
usually
crashed into the Sun. Some, however, were intercepted by the
Earth,
with catastrophic consequences. Beaumont saw the widespread loam
and
gravel deposits of the northern latitudes as being evidence of an
impact, associating the event with the Phaeton myth and the
floods of
both Noah and Deucalion. Since Orosius placed the Deucalion Flood
810
years before the founding of Rome, Beaumont estimated that the
impact
had occurred around 1560 B.C. [24].
Moving forward two decades, we come to a rather better-known
catastrophist, Immanuel Velikovsky (1895-1979). In 1950, this
Russian-born psycho-analyst, then living in America, launched a
comprehensive assault on the uniformitarian consensus when he
proposed
a highly-controversial scenario in his book, Worlds in Collision.
On
the basis of ancient records and myths from around the world,
Velikovsky argued that the most recent of a series of global
catastrophes of extraterrestrial origin was initiated when Venus
was
ejected from the core of Jupiter as a comet (i.e. as a body with
a
substantial tail), and passed very close to the Earth around 1450
B.C.,
giving rise to the Phaeton myth, and causing catastrophic events
such
as the plagues of Egypt and the flood of Deucalion [25].
As to catastrophes in earlier times, Velikovsky summarised his
ideas
from an unpublished book in the journal, Kronos, in 1979,
suggesting
that because myths often refer to a Golden Age associated with
the
figure known in Roman mythology as Saturn, the Earth might
originally
have been a satellite of the planet bearing that name. Events
related
to its subsequent escape from Saturn's influence caused the flood
of
Noah [26].
Partly because of an attempt by some American academics to
suppress
Velikovsky's writings, they stimulated considerable interest in
the
subject of global catastrophes affecting the Earth. Also, many
people,
particularly young ones, were enthused by Velikovsky's
exortations not
to accept orthodox opinions as a matter of course. So, for
example, in
an address given in 1953 to the graduate college forum of
Princeton
University, and included as a supplement to his 1956 book, Earth
in
Upheaval, Velikovsky repeatedly urged members of his audience to
"dare"
to formulate their own views [23,27].
A variety of writers, including scientists and other mainstream
scholars, eventually made a serious effort to assess Velikovsky's
work.
In 1973, Glasgow University archaeologist, Euan Mackie, wrote in
New
Scientist that, regardless of whether Velikovsky's scenario
seemed
plausible, he had formulated hypotheses which should be tested in
the
normal way. In the following year, together with Harold Tresman,
Brian
Moore and Martin Sieff, Mackie became a founding member of the
Society
for Interdisciplinary Studies (SIS), an organisation designed to
provide a forum for this to happen [28,29].
Twenty five years further on, as the SIS celebrates its silver
jubilee,
various aspects of catastrophism, although not Velikovsky's
specific
theories, have become incorporated into mainstream science.
However, at
the time the SIS was formed, the gradualist paradigm was
supremely
dominant, as it had been throughout the previous hundred years,
and any
attempts to suggest catastrophist mechanisms for events in
geology or
evolution were viewed with great suspicion in orthodox academic
circles
and generally ignored. Exactly the same applied to catastrophist
explanations for events in ancient history, particularly ones in
the
Middle East. Rightly or wrongly, such arguments were generally
seen as
moves to provide support for a literal interpretation of the
Bible
[18,28].
When the British archaeologist, Sir Leonard Woolley, excavated
the
ancient Sumerian city of Ur, in what is now southern Iraq,
between 1928
and 1934, he found a 3 metre thick layer of alluvial silt on top
of the
levels of the Ubaid Period (conventionally dated to around 4000
B.C.)
and beneath the first traces of the succeeding Uruk Period. To
some,
including Woolley himself, this seemed like evidence for the
flood of
Noah. However, no other sites were found to show similar alluvial
deposits during the Ubaid Period. On the other hand, at the
nearby city
of Shuruppak (the modern Fara), there was evidence of a flood
during
the Early Dynastic Period, around 2750 B.C., and an alluvial
deposit
dating from around the same time was found at another Sumerian
site,
the city of Kish. However, no serious investigation took place as
to
whether there had been a widespread flood in Sumer during the
Early
Dynastic Period, as this would have smacked of unfashionable
"Biblical
Archaeology". Instead, it was often suggested that accounts
of some
strictly localised events in the region, caused by the Tigris
and/or
Euphrates bursting their banks, at different times and in
different
places, might have been used mistakenly by later generations as
the
basis for both the Uta-Napishtim and the Noah stories [30,31].
Ice Ages
Moving forward to the present day, let us try to disregard the
prejudices of the past and ask the question: is there any
geological
evidence for a world-wide flood? The answer is a categoric
"No!", in
terms of all the continents being covered by water, as described
in
Genesis. From the time animals began living on the land, the
closest we
have been to that situation was probably during the Late
Cretaceous
Period, when large parts of North America, Africa and Eurasia
were
covered by shallow seas. That was the time when the chalk now
familiar
to us from the cliffs and uplands of southern England and
northern
France was formed from the shells of sea-creatures. The same
chalk
rocks also underlie the entire Paris basin, as described by
Cuvier.
However, the Late Cretaceous was over 65 million years ago,
according
to generally accepted dates, long before human beings were on the
scene
to formulate flood myths [32,33].
At the end of the Cretaceous Period, sea-levels fell markedly,
draining
the shallow epicontinental seas. That was the time of the famous
K-T
event, when a large asteroid or comet of around 10 kilometres in
diameter struck Mexico, a million cubic kilometres of lava poured
out
over central India, and many species of animals, including all
the
dinosaurs, became extinct. Apart from another wave of extinctions
during the Eocene-Oligocene transition around 35 million years
ago,
when sea levels were again very low, it is generally thought that
the
next major crisis was a series of Ice Ages which spanned the
Pleistocene Epoch, beginning around 2 million years ago and
ending
around 11,500 years ago. This was the period which produced the
loam
and gravel layer much investigated by nineteenth century
catastrophists, as we have already noted [18,33,34].
In the prevailing gradualist scenario, the advance and retreat of
the
glaciers was thought, from ideas suggested by the Scottish
"independent
thinker", James Croll, and developed by the Serbian
physicist, Milutin
Milankovitch, to be related to a slow tumble of the Earth about
its
axis of rotation [15,18].
In contrast, various writers have suggested that the impact of a
large
asteroid could initiate or terminate an Ice Age, depending on the
circumstances [18,35-38].
An Ice Age could also be caused by a sustained period of smaller
impacts, together with atmospheric dusting, perhaps linked to the
disintegration of a giant comet, as in the hypothesis put forward
by
the British astronomers, Victor Clube and Bill Napier. Clube and
Napier
believe that Comet Encke, the asteroid Oljato and the Taurid
meteors
are the remnants of a giant comet, and extrapolations backwards
from
present orbits indicate that the break-up may have occurred about
9,500
years ago. However, the giant comet may have influenced the Earth
for
thousands of years prior to this, causing an atmospheric
dust-cloud
which had largely cleared by the time that Encke split from
Oljato.
Indeed, ice core studies have indicated that there was a great
deal of
dust deposited during the last 10,000 years of the Pleistocene.
Furthermore, this has the same chemical content as dust recovered
from
peat moss in the Tunguska region, where another fragment of the
same
cometary system may have struck in 1908. However, much more
evidence
will need to be produced if the Clube/Napier explanation for Ice
Ages
is to become established [13,18,39].
On the other hand, no rival theory can provide, in itself, a
satisfactory explanation. Even if the Milankovitch theory,
favoured by
gradualists, could explain the fluctuations of the ice sheets
during
the Pleistocene, it says nothing about why we must go back 250
million
years to the Permian Period to find the next most recent Ice Age.
Moreover, a recent detailed study of prehistoric climate changes
at
Devil's Hole, Nevada, has shown that not even in the Pleistocene
Epoch
does the Milankovitch theory provide a good explanation for the
sequence of events, at least at this particular location. A
similar
problem applies to theories involving isolated extraterrestrial
impacts, since the best evidence for a major impact event is at
the end
of the Cretaceous Period, 65 million years ago, when no Ice Age
occurred [12,15,18].
Vulcanism is another factor which may have contributed to
atmospheric
cooling in the Pleistocene, because it undoubtedly occurred in
extensive fashion at the time. Furthermore, it is generally
accepted
that the Toba super-eruption in the East Indies took place close
to the
onset of the most recent of the Pleistocene Ice Ages, the Würm,
75,000
years ago. On the other hand, the extensive vulcanism of the Late
Cretaceous did not lead to an Ice Age. Plate tectonics seems to
provide
at least a partial explanation for the Permian and the previous
(Ordovician) glaciation, for continents apparently drifted over
the
poles at these (and only these) times during the Palaeozoic and
Mesozoic Eras. Land at or near a pole would have provided a
platform
for snow to settle on, reducing temperatures by reflecting the
Sun's
rays back into space. It would also have facilitated the
spreading of
ice-sheets, for these form and spread more easily over land than
over
sea. However, Antarctica moved into a position over the South
Pole
during the Eocene Epoch, long before the start of the first
Pleistocene
Ice Age, and it is still there today, after the termination of
the last
of them [18,33,40].
Thus it seems likely that a proper explanation for Ice Ages must
involve the interplay of several factors from a list including
asteroid
impacts, vulcanism, atmospheric dust, continental drift and
Milankovitch cycles. They were clearly complex events [18].
Moreover, regardless of the causes of Ice Ages, even the effects
seem
much less straightforward than generally supposed. For example,
the
glaciations of the northern hemisphere were not simply times when
the
polar ice cap expanded in fairly regular fashion: Siberia and
Alaska,
areas now noted for their long, cold, winters, remained largely
ice-free when much of northern Europe, Greenland and Canada was
covered
by an ice sheet to a depth of 2-3 km. Also, as noted by Cuvier,
unputrefied carcasses of mammoths, dating from the Late
Pleistocene,
have been found in Siberia, even in regions within the Arctic
circle,
where no large wild animals live today. In those times, in
contrast,
sufficient vegetation must have been available, at least during
the
summer months, to provide sustenance for herds of grazing
animals. When
the mammoths died, temperatures must have been falling rapidly,
even
though the final Ice Age of the Pleistocene, and the epoch
itself, was
drawing to a close. It is difficult to come up with an
explanation
which is entirely satisfactory. Even if the mammoths died during
a late
cooling episode, it still has to be considered strange that, as
temperatures subsequently rose very significantly elsewhere, they
and
the land which previously supported them remained in a
permanently
frozen state [18,22,41].
Elsewhere, when the ice-sheets melted at the end of the
Pleistocene,
the release of the stored-up water led to a rise in sea-level of
over
100 metres. For many years, it was generally assumed that this
had been
a gradual, even-paced process. However, it now seems that the
deglaciation, and associated changes in the oceans, took place in
rapid
fashion [18,42,43].
Some have even challenged the generally-held view that worldwide
temperatures had been falling from the Middle Miocene, about 18
million
years ago, all the way through to the onset of the Pleistocene
glaciations. They have suggested that the freezing and thawing
episodes
which occurred around 12,000 years ago were not a continuation of
previous trends, nor did they take place over a long timescale.
So, for
example, the retired British geologists, Derek Allan and Bernard
Delair, argued in their 1995 book, When the Earth Nearly Died,
that
catastrophic events, including an increase in the axial tilt of
the
Earth, occurred around 11,500 years ago. The catastrophes were
caused
by the close passage of a sizeable cosmic body (which gave rise
to the
Phaeton legend) and the actual impact of a number of smaller
companions. According to Allan and Delair, these could all have
been
products of the Vela supernova explosion, which at the time was
thought
to have occurred in a part of the Galaxy close to our Solar
System
between 14,300 and 11,000 years ago, although it now seems that
it
might have happened much more recently than that, around 700
years ago
[41,44].
Whatever their origin, the extraterrestrial bodies generally
struck the
Earth whilst travelling in a northeast to southwesterly direction
from
Alaska to South America. As evidence, Allan and Delair drew
attention
to the presence of innumerable oval lakes with a NE/SW
orientation
along the supposed path [18,41].
In the view of Allan and Delair, these events also caused
extensive
vulcanism, together with hurricanes and massive floods. As a
consequence of the increased tilt of the Earth, there would have
been a
change towards colder climates at high latitudes, exacerbated by
the
dust cloud resulting from impacts and volcanoes. So, the polar
ice caps
would have expanded, and flood water which could not immediately
drain
back to the sea might have been trapped as ice. In this view,
therefore, as with that of the catastrophist diluvialists of the
early
nineteenth century, the "erratic" boulders and the loam
and gravel
deposits of northern regions owed more to transport by flood
water than
by glaciers. To Allan and Delair, this scenario is more plausible
than
the conventional paradigm in its explanation of the frozen
mammoths of
Siberia, the even more extraordinary "muck" deposits of
Alaska, which
contain animal remains, molluscs, vegetation, ice and volcanic
ash in a
frozen, tangled mass, and the similar mixed deposits stuffed into
caves
at more southerly latitudes [18,27,41].
Velikovsky's Saturn hypothesis, which has been developed by
Dwardu
Cardona, David Talbott and Ev Cochrane, amongst others, would
also seem
to require a short, catastrophic transition between the Golden
Age and
present-day conditions, with no obvious space for glaciations of
long
duration [45-47].
Yet another viewpoint on what happened during the Late
Pleistocene was
provided by the American science historian, Charles Hapgood. As
we saw
earlier, Hapgood argued that the entire crust of the Earth must,
on
occasions, have suffered slippage relative to the core. That
would, of
course, have brought some new areas into polar regions, with
others
being moved away from them. Moreover, if a crustal dislocation
brought
land over a pole, where previously there had been just frozen
water,
then the ice-cap would expand, and vice versa [18,22,48-50].
Geologists have generally been of the opinion that the forces
required
to bring about a crustal dislocation would be so great as to rule
out
the possibility of such an event. However, Hapgood countered that
there
were, nevertheless, good reasons for thinking that such slippages
had
actually occurred. On the assumption that the magnetic poles
never
stray far from the axis of rotation, he argued that
palaeomagnetic
evidence showed that the location of the geographical polar
regions had
changed over 200 times during the course of the Earth's history,
some
of these changes being far too dramatic to be explained by the
normal
processes of continental drift. So, around 80,000 years ago, an
area of
the Yukon district of Canada lay over the North Pole, to be
replaced
within a few thousand years by a region of the North Atlantic
between
Greenland and Norway. By around 50,000 years ago, the pole was
located
in the vicinity of Hudson Bay, Canada, before moving to its
present
position between 17,000 and 12,000 years ago. Similar events took
place
in the southern hemisphere, the South Pole moving to its present
position on the main Antarctic continent from an area between
Wilkes
Land and Western Australia [22].
According to this hypothesis, therefore, Canada and the USA moved
away
from the North Pole at the end of the Pleistocene Epoch, whilst
Siberia
moved closer to the polar region. This would explain why the
northern
ice cap receded at this time, as the pole was no longer sited
within a
continent, and why frozen mammoths have been found in Siberia. At
the
opposite end of the Earth, Antarctica moved over the South Pole,
so the
southern ice cap would then have expanded [22].
However, results of recent studies of ancient climates, based on
oxygen
isotope determinations, appear to support the more conventional
view of
the Pleistocene Ice Ages, rather than the
"single-recent-catastrophe"
hypothesis or the "crustal-displacement" theory. Water
contains two
isotopes of oxygen, the lighter one (oxygen-16) evaporating more
easily
than the heavier one (oxygen-18). When temperatures are low and
ice-sheets are spreading, trapping, as frozen snow, water taken
by
evaporation from the oceans, the oxygen-16/oxygen-18 ratio of the
water
remaining in the oceans will be relatively low. Conversely, when
temperatures are high, and more water is being returned to the
oceans
from ice-sheets than is being removed by evaporation, the
oxygen-16/oxygen-18 ratio will be relatively high. The same
ratios
would be found in the shells of creatures living in the seas at
the
time, so the measurement of oxygen isotope ratios in marine
fossils
gives an indication of the ocean temperature when they were
living.
Similar conclusions can also be drawn from oxygen isotope ratios
in the
individual layers of the northern and southern ice-sheets, for it
is
thought that each layer was formed from the compressed snows of a
single year.
Oxygen isotope ratios in the shells of microfossils in deep-sea
cores
from the North Atlantic have demonstrated temperature
fluctuations
throughout the Pleistocene, with even the highest average
temperatures
of these times being far lower than the typical temperatures of
the
Miocene. A correlation has also been demonstrated between
climatic
events in the North Atlantic and ones from China. Comparisons of
Antarctic and Greenland climates over the past 100,000 years
suggest
that the same glacial-interglacial sequences took place in both
polar
regions, and these were consistent with temperature changes in
the
oceans. Although there were some variations in timing between
different
locations, possibly due to the effects of ocean currents, there
were no
times when climatic trends in Greenland and Antarctica were
moving
consistently in opposite directions, which might have been
expected if
the crustal-displacement theory was correct. Furthermore, ice
cores
from different parts of Antarctica all show a generally upward
drift in
temperatures between 20,000 and 10,000 years ago, the period
during
which, according to Hapgood, the continent moved over the south
pole,
so all three sites should have become significantly colder, not
warmer
[33,42,51,52].
Therefore, despite some anomalous features, which have still to
be
explained, and concerns about the nature of some of the evidence,
this,
in the main, continues to indicate that a number of major cooling
episodes, affecting climate in all parts of the world, occurred
at
intervals throughout the Pleistocene Epoch [18,53].
Extinctions of animal species indeed occurred throughout the
Pleistocene, but were particularly marked at or near its
conclusion,
during the transition to the Holocene. As a whole, the Late
Pleistocene
extinctions were minor compared to some earlier mass extinctions,
such
as those at the ends of the Permian and Cretaceous Periods, but
large
land animals were profoundly affected. North America lost three
quarters of its large animals, 33 genera of them, between 12,000
and
10,000 years ago. In South America, 46 genera disappeared at
around the
same time, and extinctions of large animals also occurred in
other
places, including Siberia, as we have already noted [18,54,55].
All of this is generally agreed, the major ongoing argument being
about
the reasons for the extinctions. Whatever causal mechanisms may
have
been involved, major environmental changes undoubtedly took place
over
the period in question. The Late Pleistocene extinctions in North
America were synchronous with the retreat of the ice sheet north
of the
Great Lakes, and with the replacement of spruce woodland and
tundra by
pine and deciduous species. Similar associations of extinctions
with
climatic changes are found throughout the world. Even in
Australia,
where the extinctions occurred earlier than elsewhere, between
26,000
and 15,000 years ago, the death of the giant marsupials was
synchronous
with a long period of heat and drought [54-56].
However, another factor which cannot be ignored is the emergence
of
humankind, and its spread into new areas. Although there are
hints that
there may have been isolated settlements in the New World at an
earlier
time, it seems clear that the main wave of settlers crossed from
Asia
into Alaska by means of a land bridge less than 30,000 years ago,
when
sea-levels were low as a result of water being trapped as ice,
and
spread over the northern and southern continents, reaching the
southern
tip of Chile about 10,000 years ago. The Clovis stone-age culture
of
southwestern USA was well-established around 11,000 years ago,
some
sites showing strong evidence of the systematic butchering of
large
animals. Similarly, humans may have reached Australia shortly
before
the times of the extinctions there, although that is less certain
[18,54-56].
Arguments are still going on about the relative merits of
climatic
change and hunting as explanations for the late Pleistocene
extinctions. However, it is reasonable to conclude that both must
have
played a part [54,55].
Holocene Catastrophes
Inevitably, catastrophic floods occurred as the ice melted and
the
Holocene Epoch began. So, for example, the retreat of the
glaciers
removed the barrier which previously held back a large volume of
water
in western Montana, causing devastating flooding of a wide area
of the
Columbia Plateau beneath the glacial lake, and gouging out deep
channels in the scablands of eastern Washington. This happened
not
once, but several times, as conditions fluctuated. When, in the
1920s,
the Chicago geologist, Harlen Bretz, first suggested that the
channels
of the Washington scablands had been created by catastrophic
floods, he
was attacked by his professional colleagues for challenging the
assumptions of the gradualist orthodoxy. For example, James
Gilluly
maintained that the channels could have been by produced by
floods of a
similar magnitude to ones which still occured in the region.
That,
however. is no longer seen to be the case, given the short
time-scale,
and also (a fact not known at the time), a source for the
catastrophic
flood-water in glacial Lake Missoula. It is now believed that
channelled scablands were also produced by waters released in
similar
catastrophic fashion from other glacial lakes in the western
United
States, such as Lake Bonneville, Utah. As the American ice
continued to
melt, a super-lake, Algonquin, was formed in the northeast. This
consisted of the present Lakes Superior, Michigan and Huron, but
occupied a much greater area [57,58].
Low-lying regions throughout the world were flooded as sea-levels
rose.
Sometimes there was a long delay between cause and effect,
increasing
the catastrophic nature of the latter. So, for example, although
it had
generally been assumed that the Black Sea expanded in area and
volume
in a gradual fashion after the end of the Pleistocene, with
excess
water flowing in from the Atlantic Ocean via the Mediterranean
Sea and
the Bosporus as the ice melted, it now seems that the Black Sea
was
sealed off from the Mediterranean by a natural dam in the
Bosporus
region which eventually burst around 5600 B.C.. Water then rushed
into
the Black Sea, flooding over 150,000 square kilometres of its
low-lying
coastal regions within a period of a year or so. Evidence for
this was
presented by geologists William Ryan and Walter Pitman, of
Columbia
University, in their 1999 book, Noah's Flood. Previously, the
Black Sea
had been an oxygen-rich, freshwater lake, but the incoming
salt-water
sank to the bottom, causing anoxic conditions in the depths, a
situation which still exists today. Radio-carbon dating studies
on
cores taken from the bed of the Black Sea at various locations
have
shown that oxygen-dependent shellfish living in deep water all
became
extinct around 5600 B.C., whilst salt-water molluscs made their
first
appearance in the Black Sea at exactly the same time. Ryan and
Pitman
argued that recollections of this catastrophic flooding, passed
on by
people whao managed to escape and migrate towards Mesopotamia,
gave
rise to the Sumerian Epic of Gilgamesh and, in turn, to the
Genesis
story of Noah and his family. That remains controversial, but the
evidence for the event itself is strong [59,60].
During the 1980s, archaeological, environmental and geological
evidence
for a world-wide catastrophic event around 2300 B.C. was
presented in
the pages of the SIS Review by an American engineer, Moe
Mandelkehr. At
the Second SIS Cambridge Conference in 1997, social historian,
Benny
Peiser, of Liverpool John Moores University, summarised the
results of
a survey he had made of some 500 reports of civilisation collapse
and
climate change at around the time of Mandelkehr's postulated
catastrophe, most of which supported his case. According to the
evidence presented, there was a change to generally drier
conditions
around 2300 B.C., with a lowering of the water-level in lakes and
oceans, and reduced river discharge. On the other hand, it
appears that
there were flood disasters in China, northern India, Greece,
Australia
and the USA at about this time [61,62].
Mandelkehr believes that the catastrophic events around 2300 B.C.
were
caused by an encounter between the Earth and a cluster of cosmic
bodies, the breakdown products of a giant comet, as in the
Clube-Napier
hypothesis. Others have also cited evidence for the impact of one
or
more extraterrestrial objects at this time. Proof is still some
way
off, but it seems likely that there was a single causal mechanism
for
the various geological and environmental changes which took
place, and
an encounter with a disintegrating comet is certainly a plausible
explanation. At the Second SIS Cambridge Conference, Bill Napier
pointed out that the impact into an ocean of even a relatively
small
cosmic body, around 200 metres in diameter, would result in
devastating
floods in coastal regions, through the action of tidal waves
[39,63-65].
Geological evidence for a global catastrophe around 1450 B.C., as
proposed by Velikovsky, is less convincing than for one around
2300
B.C.. Much of the evidence for catastrophes which Velikovsky
presented
in Earth in Upheaval, such as the Alaskan "muck"
deposits, was actually
associated with the Pleistocene-Holocene transition. Although
Velikovsky suggested otherwise, the end of the Pleistocene is
generally
thought to have ended 8,000 years before the time of the supposed
Venus
catastrophe. It seems that there may have been localised
catastrophes
around 1450 B.C., but nothing more than that [27,66].
Conclusion
Whilst there is no geological evidence at any time for a
worldwide
flood on the scale described in Genesis, there are abundant
indications
of widespread floods and other catastrophes during the period
humans
have been living on the Earth, in particular during the
Pleistocene-Holocene transition around 11,500 years ago, and near
the
beginning of the Late Holocene, around 2300 B.C.. There are a
large
number of unanswered questions about events at both of these
times.
Hopefully we shall not have to wait until the golden jubilee of
the SIS
in 2024 before we get satisfactory answers to them.
---
Professor Trevor Palmer is Head of the Department of Life
Sciences
and Dean of the Faculty of Science and Mathematics at Nottingham
Trent University. He is the Chairman of the Society for
Interdisciplinary Studies and the author of CONTROVERSY -
CATASTROPHISM AND EVOLUTION: THE ONGOING DEBATE (Plenum Company:
New
York/London, 1998)
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during Bronze Age Civilisations, Archaeopress,
Oxford, 1998, pp.
109-116; M.Baillie, Exodus to Arthur, Batsford,
London, 1999.
66.R.Jastrow, `Velikovsky - hero or heretic?', SIS Review VII
(1985),
pp. 21-23.
Copyright 1999, Trevor Palmer