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vendingmachine commented on the word basement rocks
"In geology, basement and crystalline basement are crystalline rocks lying above the mantle and beneath all other rocks and sediments. They are sometimes exposed at the surface, but often they are buried under miles of rock and sediment.
Basement rock refers to any hard, crystalline or recrystallized rock associated with the Precambrian Age, including ancient Archaean cratonic rocks, metamorphic rocks associated with mobile belts, and anorogenic intrusions of variable age. It can be considered as any intrusive or hypabyssal, felsic, igneous or metamorphic rock composed predominantly of quartz and feldspar."
June 18, 2024