Neptunism

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Neptunism is a discredited and obsolete scientific theory of geology proposed by Abraham Werner in the late 18th century that proposed rocks formed from the crystallisation of minerals in the early Earth's oceans.

It was named after Neptune, the ancient Roman name for the ancient Greek god of the sea, Poseidon. Neptunism lost mainstream scientific support in the early 19th century as the principle of uniformitarianism was shown to fit better with the geological facts as they became better known. Plutonism then replaced Neptunism. In modern geology, many different forms of rock formation are acknowledged, and the formation of sedimentary rock occurs through processes very similar to those described by Neptunism.

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