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Explian about contact between granite and sandstone?


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2007-07-19 15:30:25
2007-07-19 15:30:25

This is a nonconformity. the contact is between an igneous and sedimentary rock formation. Granite should be on the bottom and sandstone on top, If this is not the case then some type of over-turning has taken place. The depositional envornment allowed sand to acculate over the top of the granite and later consolodated into a rock. This is called a contact. Many years ( perhaps millions) passed) before the whole mass became a rock formation. Can you identify other contacts in the area? If so, you may be able to date this contact and correlate it to other areas in your vicinity. See if you can trace it and look on geologic maps to see if it is mapped. If not, you may have found something that no one has yet discovered.

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Granite is sometimes found in sandstone from cementation of glacial drift. If sandstone is found in granite, it would be quite unusual in that the sandstone had not metamorphosed from the heat of the magma intrusion that created the granite.

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Granite becomes Sandstone when water erodes the Granite on Earths surface, and then deposits the sediment.

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granite is older, Granite goes back more than 300 mya to the Ancestral Rockies or the first Rocky Mountains-Fountain Formation

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Sandstone is a delicate rock. Sandstone weathers faster.

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None of those. Scoria, Pumice and Granite are igneous rocks. Sandstone is sedimentary.


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