Bottomset beds form along the bottom of larger bodies of water where a river or stream enters. These beds consist of the finer silt and clay which are swept into deeper water. The beds lie parallel to the depositional surface which is often nearly horizontal. These beds are the initial deposits of a prograding delta.
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Section through a lake delta Leet, L. D., S. Judson, and M. E. Kauffman.
Physical Geology.
Prentice-Hall, Inc., Englewoods Cliff, New Jersey, 1982.
