. , Kentucky, a representation of Noah's ark, operated by
Answers in Genesis, a
young Earth creationist organization. In pre-Christian times,
fossils found on land were thought by Greek philosophers—including
Xenophanes,
Xanthus and
Aristotle—to be evidence that the sea had in past ages covered the land. Their concept of vast time periods in an eternal cosmos was rejected by early Christian writers as incompatible with their belief in Creation by God. Among the church fathers,
Tertullian spoke of fossils demonstrating that mountains had been overrun by water without explicitly saying when.
Chrysostom and
Augustine believed that fossils were the remains of animals that were killed and buried during the brief duration of the
Genesis flood, and later
Martin Luther viewed fossils as having resulted from the flood. The earliest documentation of the famous fossil fishes of the
Sannine Formation comes from
Eusebius, who cites them as being evidence of the Biblical flood. Other scholars, including
Avicenna, thought fossils were produced in the rock by "petrifying virtue" acting on "seeds" of plants and animals. In 1580,
Bernard Palissy speculated that fossils had formed in lakes, and
natural historians subsequently disputed the alternatives.
Robert Hooke made empirical investigations and doubted that the numbers of fossil shells or depth of shell beds could have formed in the one year of Noah's flood. In 1616,
Nicolas Steno showed how chemical processes changed organic remains into stone fossils. His fundamental principles of
stratigraphy published in 1669 established that rock strata formed horizontally and were later broken and tilted, though he assumed these processes would occur within 6,000 years including a worldwide flood.
Theories of the Earth In his influential
Principles of Philosophy of 1644,
René Descartes applied his mechanical
physical laws to envisage swirling particles forming the Earth as a layered sphere. This
natural philosophy was recast in biblical terms by the theologian
Thomas Burnet, whose
Sacred Theory of the Earth published in the 1680s proposed complex explanations based on natural laws, and explicitly rejected the simpler approach of invoking
miracles as incompatible with the methodology of natural philosophy (the precursor to science). Burnet maintained that less than 6,000 years ago the Earth had emerged from chaos as a perfect sphere, with paradise on land over a watery abyss. This crust had dried out and cracked, and its collapse caused the biblical deluge, forming mountains as well as caverns where the water retreated. He made no mention of fossils but inspired other diluvial theories that did. In 1695,
John Woodward's
An Essay Toward a Natural History of the Earth viewed the Genesis flood as dissolving rocks and soil into a thick slurry that caught up all living things, which, when the waters settled, formed strata according to the
relative density of these materials, including fossils of the organisms. When it was pointed out that lower layers were often less dense and forces that shattered rock would destroy organic remains, he resorted to the explanation that a divine miracle had temporarily suspended gravity.
William Whiston's
New Theory of the Earth of 1696 combined scripture with
Newtonian physics to propose that the original chaos was the atmosphere of a
comet with the days of creation each taking a year, and the Genesis flood had resulted from a second comet. His explanation of how the flood caused mountains and the fossil sequence was similar to Woodward's.
Johann Jakob Scheuchzer wrote in support of Woodward's ideas in 1708, describing some fossil vertebrae as bones of sinners who had perished in the flood. A skeleton found in a quarry was described by him in 1726 as
Homo diluvii testis, a giant human testifying to the flood. This was accepted for some time, but in 1812 it was shown to be a prehistoric salamander.
Beginnings of modern geology The modern science of geology developed in the 18th century; the term "geology" was popularised by the
Encyclopédie of 1751. Steno's categorisation of strata was expanded by several geologists, including
Johann Gottlob Lehmann who believed that the oldest mountains had formed early in the Creation, and categorised as
Flötz-Gebürge stratified mountains with few ore deposits but with thin layers containing fossils, overlain by a third category of superficial deposits. In his 1756 publication he identified 30 different layers in this category which he attributed to the action of the Genesis deluge, possibly including debris from the older mountains. Others including
Giovanni Arduino attributed secondary strata to natural causes:
Georg Christian Füchsel said that geologists had to take as standard the processes in which nature currently produces solids, "we know no other way", and only the most recent deposits could be attributed to a great flood. Lehman's classification was developed by
Abraham Gottlob Werner who thought that rock strata had been deposited from a primeval global ocean rather than by Noah's flood, a doctrine called
Neptunism. The idea of a young Earth was further undermined in 1774 by
Nicolas Desmarest, whose studies of a succession of extinct volcanoes in Europe showed layers which would have taken long ages to build up. The fact that these layers were still intact indicated that any later flood had been local rather than universal. Against Neptunism,
James Hutton proposed an indefinitely old cycle of eroded rocks being deposited in the sea, consolidated and heaved up by volcanic forces into mountains which in turn eroded, all in natural processes which continue to operate.
Catastrophism and diluvialism The first professional geological society, the
Geological Society of London, was founded in 1807. By this time, geologists were convinced that an immense time had been needed to build up the huge thickness of rock strata visible in quarries and cliffs, implying extensive pre-human periods. Most accepted a basic
time scale classifying rocks as primitive, transition,
secondary, or
tertiary. Several researchers independently found that strata could be identified by characteristic fossils: secondary strata in southern England were mapped by
William Smith from 1799 to 1815.
Cuvier and Jameson Georges Cuvier, working with
Alexandre Brongniart, examined tertiary strata in the region around Paris. Cuvier found that fossils identified rock formations as alternating between marine and terrestrial deposits, indicating "repeated irruptions and retreats of the sea" which he identified with a long series of sudden catastrophes which had caused
extinctions. In his 1812
Discours préliminaire to his
Recherches sur les ossemens fossiles de quadrupeds put forward a synthesis of this research into the long prehistoric period, and a historical approach to the most recent catastrophe. His historical approach tested empirical claims in the biblical text of Genesis against other ancient writings to pick out the "real facts" from "interested fictions". In his assessment,
Moses had written the account around 3,300 years ago, long after the events described. Cuvier only discussed the Genesis flood in general terms, as the most recent example of "an event of an [
sic] universal catastrophe, occasioned by an irruption of the waters" not set "much further back than five or six thousand years ago". The historical texts could be loosely related to evidence such as overturned strata and "heaps of
debris and rounded pebbles". An English translation was published in 1813 with a preface and notes by
Robert Jameson,
Regius Professor of
Natural history at the
University of Edinburgh. He began the preface with a sentence which ignored Cuvier's historical approach and instead deferred to
revelation: This sentence was removed after the second edition, and Jameson's position changed as shown by his notes in successive editions, but it influenced British views of Cuvier's concept. In 1819,
George Bellas Greenough, first president of
The Geological Society, issued
A Critical Examination of the First Principles of Geology stating that unless erratic boulders deposited hundreds of miles from their original sources had been moved by seas, rivers, or collapsing lakes, "the only remaining cause, to which these effects can be ascribed, is a Debacle or Deluge."
Buckland and the English school of geologists Conservative geologists in Britain welcomed Cuvier's theory to replace Werner's Neptunism, and the
Church of England clergyman
William Buckland became the foremost proponent of flood geology as he sought to get the new science of geology accepted on the curriculum of the
University of Oxford. In 1818, he was visited by Cuvier, and in his inaugural speech in 1819 as the first professor of geology at the university he defended the subject against allegations that it undermined religion. His speech, published as
Vindiciae Geologicae; or, The Connexion of Geology with Religion Explained, equated the last of a long series of catastrophes with the Genesis flood, and said that "the grand fact of an 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, to explain the phenomena of diluvian action which are universally presented to us, and which are unintelligible without recourse to a deluge exerting its ravages at a period not more ancient than that announced in the Book of Genesis." The evidence he proposed included erratic boulders, extensive areas of gravel, and landforms which appeared to have been scoured by water. This inaugural address influenced the geologists
William Conybeare and
William Phillips. In their 1822 book on
Outlines of the Geology of England and Wales Conybeare referred to the same features in an introduction about the relationship between geology and religion, describing how a deluge causing "the last great geological change to which the surface of our planet appears to have been exposed" left behind the debris (which he named in
Latin Diluvium) as evidence for "that great and universal catastrophe to which it seems most properly assignable". In 1823 Buckland published his detailed account of "Relics of the Flood",
Reliquiae Diluvianae; or,
Observations on the Organic Remains Contained in Caves, Fissures, and Diluvial Gravel and on Other Geological Phenomena Attesting the Action of an Universal Deluge, incorporating his research suggesting that animal fossils had been dragged into the
Kirkdale Cave by
hyenas then covered by a layer of red mud washed in by the deluge. Buckland's views were supported by other Church of England clergymen naturalists: his Oxford colleague
Charles Daubeny proposed in 1820 that the volcanoes of the
Auvergne showed a sequence of lava flows from before and after the flood had cut valleys through the region. In an 1823 article "On the deluge",
John Stevens Henslow, professor of mineralogy at the
University of Cambridge, affirmed the concept and proposed that the flood had originated from a comet, but this was his only comment on the topic.
Adam Sedgwick,
Woodwardian Professor of Geology at Cambridge, presented two supportive papers in 1825, "On the origin of alluvial and diluvial deposits", and "On diluvial formations". At this time, most of what Sedgwick called "The English school of geologists" distinguished superficial deposits which were "diluvial", showing "great irregular masses of sand, loam, and coarse gravel, containing through its mass rounded blocks sometimes of enormous magnitude" and supposedly caused by "some great irregular inundation", from "alluvial" deposits of "comminuted gravel, silt, loam, and other materials" attributed to lesser events, the "propelling force" of rivers, or "successive partial inundations". In America,
Benjamin Silliman at
Yale College spread the concept and in an 1833 essay dismissed the earlier idea that most stratified rocks had been formed in the flood, while arguing that surface features showed "wreck and ruin" attributable to "mighty floods and rushing torrents of water". He said that "we must charge to moving waters the undulating appearance of stratified sand and gravel, often observed in many places, and very conspicuously in the plain of
New Haven, and in other regions of Connecticut and New England", while both "bowlder stones" and sandy deserts across the world could be attributed to "diluvial agency".
Criticisms and retractions: the downfall of diluvialism Other naturalists were critical of diluvialism:
Church of Scotland minister
John Fleming published opposing arguments in a series of articles from 1823 onwards. He was critical of the assumption that fossils resembling modern tropical species had been swept north "by some violent means", which he regarded as absurd considering the "unbroken state" of fossil remains. For example, fossil
mammoths demonstrated adaptation to the same northern climates now prevalent where they were found. He criticized Buckland's identification of red mud in the Kirkdale cave as diluvial, when nearly identical mud in other caves had been described as
fluvial. While Cuvier had reconciled geology with a loose reading of the biblical text, Fleming argued that such a union was "indiscreet" and turned to a more literal view of Genesis: When Sedgwick visited Paris at the end of 1826 he found hostility to diluvialism:
Alexander von Humboldt ridiculed it "beyond measure", and
Louis-Constant Prévost "lectured against it". In the summer of 1827 Sedgwick and
Roderick Murchison travelled to investigate the geology of the
Scottish Highlands, where they found "so many indications of
local diluvial operations" that Sedgwick began to change his mind about it being worldwide. When
George Poulett Scrope published his investigations into the Auvergne in 1827, he did not use the term "diluvium". He was followed by Murchison and
Charles Lyell whose account appeared in 1829. All three agreed that the valleys could well have been formed by rivers acting over a long time, and a deluge was not needed. Lyell, formerly a pupil of Buckland, put strong arguments against diluvialism in the first volume of his
Principles of Geology published in 1830, though suggesting the possibility of a deluge affecting a region such as the low-lying area around the
Caspian Sea. Sedgwick responded to this book in his presidential address to the Geological Society in February 1830, agreeing that diluvial deposits had formed at differing times. At the society a year later, when retiring from the presidency, Sedgwick described his former belief that "vast masses of diluvial gravel" had been scattered worldwide in "one violent and transitory period" as "a most unwarranted conclusion", and therefore thought "it right, as one of my last acts before I quit this Chair, thus publicly to read my recantation." However, he remained convinced that a flood as described in Genesis was not excluded by geology. One student had seen the gradual abandonment of diluvialism:
Charles Darwin had attended Jameson's geology lectures in 1826 and at Cambridge became a close friend of Henslow before learning geology from Sedgwick in 1831. At the outset of the
Beagle voyage Darwin was given a copy of Lyell's
Principles of Geology and at the first landfall began his career as a geologist with investigations which supported Lyell's concept of
slow uplift while also describing loose rocks and gravel as "part of the long disputed Diluvium". Debates continued over the part played by repeated exceptional catastrophes in geology, and in 1832
William Whewell dubbed this view
catastrophism, while naming Lyell's insistence on explanations based on current processes
uniformitarianism. Buckland, too, gradually modified his views on the deluge. In 1832 a student noted Buckland's view on cause of diluvial gravel, "whether is Mosaic inundation or not, will not say". In a footnote to his
Bridgewater Treatise of 1836, Buckland backed down from his former claim that the "violent inundation" identified in his
Reliquiae Diluvianae was the Genesis flood: For a while, Buckland had continued to insist that
some geological layers were related to the Great Flood, but grew to accept the idea that they represented multiple inundations which occurred well before humans existed. In 1840 he made a field trip to Scotland with the Swiss geologist
Louis Agassiz and became convinced that the "diluvial" features which he had attributed to the deluge had, in fact, been produced by ancient
ice ages. Buckland became one of the foremost champions of Agassiz's theory of
glaciations, and diluvialism went out of use in geology. Active geologists no longer posited sudden ancient catastrophes with unknown causes and instead increasingly explained phenomena by observable processes causing slow changes over great periods.
Scriptural geologists, and later commentary Scriptural geologists were a heterogeneous group of writers in the early 19th century who claimed "the primacy of
literalistic biblical
exegesis" and a short
young Earth time scale. Their views were marginalised and ignored by the
scientific community of their time. They generally lacked any background in geology and had little influence even in church circles. Many of them quoted obsolete geological writings. Among the most prominent,
Granville Penn argued in 1822 that "mineral geology" rejected revelation, while true "Mosaical geology" showed that God had created primitive rock formations directly, in correspondence with the laws which God then made to produce subsequent effects. A first revolution on the third day of creation deepened the oceans so water rushed in, and in the deluge 1,656 years afterwards a second revolution sank land areas and raised the sea bed to cause a swirling flood which moved soil and fossil remains into stratified layers, after which God created new vegetation. As Genesis appeared to show that the rivers of
Eden had survived this catastrophe, he argued that the verses concerned were an added "parenthesis" which should be disregarded. In 1837
George Fairholme expressed disappointment about disappearing belief in the deluge, and about Sedgwick and Buckland recanting diluvialism while putting forward his own
New and Conclusive Physical Demonstrations which ignored geological findings to claim that strata had been deposited in a quick continuous process while still moist. Geology was popularized by several authors.
John Pye Smith's lectures published in 1840 reconciled an extended time frame with Genesis by the increasingly common
gap theology or
day-age theology, and said it was likely that the gravel and boulder formations were not diluvium but had taken long ages predating the creation of humans. He reaffirmed that the flood was historical as a local event, something which the 17th century theologians
Edward Stillingfleet and
Matthew Poole had already suggested on a purely biblical basis. Smith also denounced the "fanciful" writings of the scriptural geologists.
Edward Hitchcock sought to ensure that geological findings could be corroborated by scripture and dismissed the scriptural geology of Penn and Fairholme as misrepresenting both scripture and the facts of geology. He noted the difficulty of equating a violent deluge with the more tranquil Genesis account.
Hugh Miller supported similar points with considerable detail. Little attention was paid to flood geology over the rest of the 19th century, its few supporters included the author
Eleazar Lord in the 1850s and the Lutheran scholar
Carl Friedrich Keil in 1860 and 1878. The visions of
Ellen G. White published in 1864 formed
Seventh-day Adventist Church views and influenced 20th century creationism. ==Creationist flood geology==