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July 7, 2006, Newsletter Issue #98: Rock Classification - Fossils

1

Tip of the Week

Some (not all!) sedimentary rocks have fossils. If a rock has fossils, it is definitely not an igneous rock (since igneous rocks begin as liquid magma). If the fossils in the rock are not deformed, it is a sedimentary rock.

But if the fossils *are* deformed, it is classified as a metamorphic rock (it used to be sedimentary, but has been subjected to pressures that deformed the fossils).


2

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