During the Mississippian, an epeiric sea covered part of North America. What type of rock deposit would provide supporting evidence for the sea?

Question

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Shale is a sedimentary rock that forms from the accumulation of mud and clay, which would be found in an epeiric sea environment. Granite, slate, and schist are all metamorphic rocks, while coal is a sedimentary rock that forms from the accumulation of organic material in a swamp or bog environment.

During the Mississippian, an Epeiric Sea Covered Part of North