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Neptunism is a
superseded scientific theory This list catalogs well-accepted theories in science and pre-scientific natural philosophy and natural history which have since been superseded by scientific theories. Many discarded explanations were once supported by a scientific consensus, b ...
of
geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ear ...
proposed by
Abraham Gottlob Werner Abraham Gottlob Werner (; 25 September 174930 June 1817) was a German geologist who set out an early theory about the stratification of the Earth's crust and propounded a history of the Earth that came to be known as Neptunism. While most tenet ...
(1749–1817) in the late 18th century, proposing that
rock Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wales ...
s formed from the
crystal A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macros ...
lisation of
mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. ( ...
s in the early
Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ...
's oceans. The theory took its name from
Neptune Neptune is the eighth planet from the Sun and the farthest known planet in the Solar System. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times ...
, the ancient
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a letter ...
god of the sea. There was considerable debate between its proponents (neptunists) and those favouring a rival theory known as
plutonism Plutonism is the geologic theory that the igneous rocks forming the Earth originated from intrusive magmatic activity, with a continuing gradual process of weathering and erosion wearing away rocks, which were then deposited on the sea bed, re- ...
which gave a significant role to volcanic origins, and which in modified form replaced neptunism in the early 19th century as the principle of
uniformitarianism Uniformitarianism, also known as the Doctrine of Uniformity or the Uniformitarian Principle, is the assumption that the same natural laws and processes that operate in our present-day scientific observations have always operated in the universe in ...
was shown to fit better with the geological facts as they became better known. Modern geology acknowledges many different forms of rock formation, and explains the formation of
sedimentary rock Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
through processes very similar to those described by neptunism.


Historical development

In the mid-eighteenth century as the investigation of
geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ear ...
found evidence such as
fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
s, naturalists developed new ideas which diverged from the
Genesis creation narrative The Genesis creation narrative is the creation myth of both Judaism and Christianity. The narrative is made up of two stories, roughly equivalent to the first two chapters of the Book of Genesis. In the first, Elohim (the Hebrew generic word ...
. Georges de Buffon proposed that the Earth was over 75,000 years old, possibly much older, and showed signs of historical development in a series of distinct
epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by ...
s.
Abraham Gottlob Werner Abraham Gottlob Werner (; 25 September 174930 June 1817) was a German geologist who set out an early theory about the stratification of the Earth's crust and propounded a history of the Earth that came to be known as Neptunism. While most tenet ...
was the inspector of mines and professor of mining and
mineralogy Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts. Specific studies within mineralogy include the proces ...
at the Mining Academy in
Freiberg Freiberg is a university and former mining town in Saxony, Germany. It is a so-called ''Große Kreisstadt'' (large county town) and the administrative centre of Mittelsachsen district. Its historic town centre has been placed under heritage c ...
(
Saxony Saxony (german: Sachsen ; Upper Saxon: ''Saggsn''; hsb, Sakska), officially the Free State of Saxony (german: Freistaat Sachsen, links=no ; Upper Saxon: ''Freischdaad Saggsn''; hsb, Swobodny stat Sakska, links=no), is a landlocked state of ...
) which became dominant in late eighteenth-century geology. His ''Short Classification and Description of Rocks'' of 1787 and his lectures set out a classification of rocks on the basis of their age based on the sequence of layers of differing material, rather than by the types of minerals as had been previous practice. He based his historical sequence of rock formation on the theory that the Earth had originally consisted of water. According to this account, the water contained material which settled out of suspension in a process of
sedimentation Sedimentation is the deposition of sediments. It takes place when particles in suspension settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the ...
to form the core of the planet and the continents as a series of layers, the oldest and hardest being
granite Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies undergro ...
while newer layers showed an increasing number of
fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
s.
Volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...
es had a minor effect, modifying the continents and adding more sediment as well as some volcanic rocks, and successive lesser floods added more layers, so that most rocks resulted from
precipitate In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called the precipitate. In case of an inorganic chemical reaction leading ...
s settling out of water. There is no indication that any of the floods in Werner's cosmogony were
Noah's flood The Genesis flood narrative (chapters 6–9 of the Book of Genesis) is the Hebrew version of the universal flood myth. It tells of God's decision to return the universe to its pre- creation state of watery chaos and remake it through the micro ...
.


The neptunist–plutonist controversy

A rival theory known as
plutonism Plutonism is the geologic theory that the igneous rocks forming the Earth originated from intrusive magmatic activity, with a continuing gradual process of weathering and erosion wearing away rocks, which were then deposited on the sea bed, re- ...
(or vulcanism) held that rocks were formed in fire. This was originally proposed by Abbé
Anton Moro Anton Lazzaro Moro (1687 in San Vito al Tagliamento – 1764) was an Italian abbot, geologist and naturalist. He was one of the leading advocates of plutonism in the early debate that confronted plutonism to neptunism, making him described by ...
(1687–1750) with reference to his studies of volcanic islands, and was taken up by
James Hutton James Hutton (; 3 June O.S.172614 June 1726 New Style. – 26 March 1797) was a Scottish geologist, agriculturalist, chemical manufacturer, naturalist and physician. Often referred to as the father of modern geology, he played a key role i ...
who put forward a
uniformitarian Uniformitarianism, also known as the Doctrine of Uniformity or the Uniformitarian Principle, is the assumption that the same natural laws and processes that operate in our present-day scientific observations have always operated in the universe in ...
theory of a
rock cycle The rock cycle is a basic concept in geology that describes transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous. Each rock type is altered when it is forced out of its equilibrium conditio ...
extending over infinite time in which rocks were worn away by weathering and erosion, then were re-formed and uplifted by heat and pressure. Neptunists differed from the plutonists in holding that
basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...
was a sedimentary deposit which included fossils and so could not be of volcanic origin. Hutton correctly asserted that basalt never contained fossils and was always insoluble, hard, and crystalline. He found geological formations in which basalt cut through layers of other rocks, supporting his theory that it originated from molten rock under the Earth's crust. The debate was not just between scientists.
Johann Wolfgang von Goethe Johann Wolfgang von Goethe (28 August 1749 – 22 March 1832) was a German poet, playwright, novelist, scientist, statesman, theatre director, and critic. His works include plays, poetry, literature, and aesthetic criticism, as well as trea ...
, one of the most respected authors of the day, took sides with the neptunists. The fourth act of his famous work ''
Faust Faust is the protagonist of a classic German legend based on the historical Johann Georg Faust ( 1480–1540). The erudite Faust is highly successful yet dissatisfied with his life, which leads him to make a pact with the Devil at a crossroads ...
'' contains a dialogue between a neptunist and a plutonist, the latter being
Mephistopheles Mephistopheles (, ), also known as Mephisto, is a demon featured in German folklore. He originally appeared in literature as the demon in the Faust legend, and he has since appeared in other works as a stock character (see: Mephistopheles in t ...
, the antagonist of the play who is a devil. Doing so he implicitly expressed his favour for the neptunist theory, though he also did so explicitly and sometimes even harshly elsewhere. The controversy lasted into the early years of the 19th century, but the works of
Charles Lyell Sir Charles Lyell, 1st Baronet, (14 November 1797 – 22 February 1875) was a Scottish geologist who demonstrated the power of known natural causes in explaining the earth's history. He is best known as the author of ''Principles of Geolo ...
in the 1830s gradually won over support for the uniformitarian ideas of Hutton and the plutonists. However,
sedimentary rock Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
s such as
limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...
are considered to have resulted from processes like those described by the neptunists, and so modern theory can be seen as a synthesis of the two approaches.


Notable neptunists

*
Abraham Gottlob Werner Abraham Gottlob Werner (; 25 September 174930 June 1817) was a German geologist who set out an early theory about the stratification of the Earth's crust and propounded a history of the Earth that came to be known as Neptunism. While most tenet ...
(1749–1817) *
Juan Ignacio Molina Fr. Juan Ignacio Molina (; (June 24, 1740 – September 12, 1829) was a Chilean Jesuit priest, naturalist, historian, translator, geographer, botanist, ornithologist, and linguist. He is usually referred to as Abate Molina (a form of Abbot Moli ...
(1740–1829): considered
basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...
a compacted
slate Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. ...
*
Johann Wolfgang von Goethe Johann Wolfgang von Goethe (28 August 1749 – 22 March 1832) was a German poet, playwright, novelist, scientist, statesman, theatre director, and critic. His works include plays, poetry, literature, and aesthetic criticism, as well as trea ...
(1749–1832) *
Robert Jameson Robert Jameson Robert Jameson FRS FRSE (11 July 1774 – 19 April 1854) was a Scottish naturalist and mineralogist. As Regius Professor of Natural History at the University of Edinburgh for fifty years, developing his predecessor John ...
(1774–1854): studied with Werner and supported neptunism *
Gustav Bischof Karl Gustav Bischof (January 18, 1792 – November 30, 1870) was a German chemist, born in Nuremberg. He studied at Erlangen where he became a university lecturer ("Privatdozent") in 1815. In 1819 he was appointed to the position of an extra-O ...
, (1792–1870), founder of geochemistry


Fictional account

The theory, and its intellectual context, are treated in
Daniel Kehlmann Daniel Kehlmann (; born 13 January 1975) is a German-language novelist and playwright of both Austrian and German nationality.Alexander von Humboldt Friedrich Wilhelm Heinrich Alexander von Humboldt (14 September 17696 May 1859) was a German polymath, geographer, naturalist, explorer, and proponent of Romantic philosophy and science. He was the younger brother of the Prussian minister, p ...
, ''Die Vermessung der Welt'' (''
Measuring the World ''Measuring the World'' (german: Die Vermessung der Welt) is a novel by German author Daniel Kehlmann, published in 2005 by Rowohlt Verlag, Reinbek. The novel re-imagines the lives of German mathematician Carl Friedrich Gauss and German geograph ...
'') of 2006.


References


Further reading

* * * {{cite book , last= Baigrie , first= Brian , title= Scientific Revolutions , work= Course Notes and Study Material , publisher= University of Toronto , date= 2006 , isbn= 9780802084859 , ref=none 18th century in science History of Earth science Obsolete geology theories