Discussion
Mud cracks preserved in a sedimentary rock indicate that the sediment was
Answer: B
Correct answer: exposed and dried after deposition
Mud cracks form when a wet fine sediment is exposed to the air and shrinks as it dries, and their preservation means the cracked surface was then buried by the next deposit. They therefore record a depositional environment that was periodically dry - a tidal flat, a river floodplain, a playa lake - and, like graded bedding, they indicate which way was up.
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