Using the stratigraphic section and photographs located in the textbook (Chapter 7 Investigation),determine the environment of deposition for the dark gray shale (there is one correct answer).
A)steep mountain front
B)river system
C)sand dunes
D)plant-rich swamp
E)muddy part of ocean

Question

Using the stratigraphic section and photographs located in the textbook (Chapter 7 Investigation),determine the environment of deposition for the dark gray shale (there is one correct answer). 
A)steep mountain front 
B)river system 
C)sand dunes 
D)plant-rich swamp 
E)muddy part of ocean

Quizplus · Accepted Answer

The dark gray shale is typically a fine-grained sedimentary rock that is commonly formed in the deeper mud-rich parts of the ocean. Its composition and texture suggest a calm and quiet environment where fine grains of clay and organic matter settled out of suspension and accumulated over time. The absence of coarse sedimentary structures such as cross-bedding, ripples, or imbrication further supports a marine depositional environment. Therefore, option E (muddy part of ocean) is the best choice for the environment of deposition for the dark gray shale.

Using the Stratigraphic Section and Photographs Located in the Textbook