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Neptunism is a superseded scientific theory of geology proposed by Abraham Gottlob Werner (1749–1817) in the late 18th century, who proposed that rocks formed from the of in the early Earth's oceans.
The theory took its name from Neptune, the ancient Ancient Rome god of the sea. There was considerable debate between its proponents (neptunists) and those favouring a rival theory known as plutonism 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 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 through processes very similar to those described by neptunism.
Abraham Gottlob Werner was the inspector of mines and professor of mining and mineralogy at the Mining Academy in Freiberg (Saxony) which became dominant in late eighteenth-century geology. His Short Classification and Description of Rocks of 1787This probably should say " Short classification and description of the various rocks"; See e.g. See also (e.g.) See also (e.g.) See also the first page (labeled "page 599") of 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 to form the core of the planet and the continents as a series of layers, the oldest and hardest being granite while newer layers showed an increasing number of . 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 settling out of water. There is no indication that any of the floods in Werner's cosmogony were Noah's flood.Ospovat, Alexander, "Werner, Abraham Gottlob," Dictionary of Scientific Biography, pp. 256–264.
Neptunists differed from the plutonists in holding that basalt 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, one of the most respected authors of the day, took sides with the neptunists. The fourth act of his famous work Faust contains a dialogue between a neptunist and a plutonist, the latter being Mephistopheles, 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 in the 1830s gradually won over support for the uniformitarian ideas of Hutton and the plutonists. However, such as limestone 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.
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