Topset,foreset,and bottomset beds together are indicative of ________ environments.

Question

Quizplus · Accepted Answer

Topset, foreset, and bottomset beds are typical of delta environments where sediment is transported and deposited by rivers and then distributed into the standing body of water. The topset beds are made of sand and mud and are deposited in the area upstream of the delta, the foreset beds are mostly sand and gravel and are deposited in the steeper part of the delta front, and the bottomset beds are made of fine-grained sediments and are deposited in the lower part of the delta. Alluvial fans and river environments do not have the standing body of water where the sediment can be deposited to form foreset and bottomset beds, and deep-marine environments have different sedimentary characteristics due to the distance from shore and different energy levels. Therefore, the best choice is C.

Topset,foreset,and Bottomset Beds Together Are Indicative of ________ Environments