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In a sequence of undisturbed sedimentary rocks, the oldest fossils will be ____.​

____________, lobe-finned bony fish, were common during the Late Paleozoic and were the closest ancestors of amphibians.

Who proposed the principle of fossil succession?

If the grains in a sedimentary rock are all roughly the same size, we describe that rock as:

The reason for trilobite extinction is well-understood.

What concept describes Earth’s crust as “floating” on denser underlying mantle?​

During the Pleistocene, several massive volcanic eruptions occurred in Yellowstone.

Which of the following layers is NOT a part of the lithosphere?

Which North American transgression and cratonic sequence occurred first during the Paleozoic?

The principle of ____________ states that fragments of a rock must be younger than the rock layer they are contained within.