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Updated: May 23, 2025
The Metamorphic Rocks are sometimes described as "Aqueo-igneous," since both water and fire helped in the forming of them. It was at one time believed, as a matter of certainty, that granite and such rocks belonged to a period much farther back than the periods of the stratified rocks.
All the various kinds of granites which constitute the Plutonic family are supposed to be of igneous or aqueo-igneous origin, and to have been formed under great pressure, at a considerable depth in the earth, or sometimes, perhaps, under a certain weight of incumbent ocean.
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