What characteristic feature of Pennsylvanian rocks distinguishes rocks of the Absaroka sequence from those of the Kaskaskia sequence as well as others of North America?

Question

Quizplus · Accepted Answer

Cyclothems are a characteristic feature of Pennsylvanian rocks, but they are not unique to the Absaroka sequence. Carbonates and coal are also common features in Pennsylvanian rocks, and are not specific to the Absaroka sequence. Conodonts and chordates are fossil groups that can be found in many different rock sequences, and are not unique to the Absaroka sequence. Therefore, the best distinguishing feature of the Absaroka sequence is the presence of cyclothems.

What Characteristic Feature of Pennsylvanian Rocks Distinguishes Rocks of the Absaroka