Elwood Atherton, Charles Collinson, and Jerry A. Lineback
The Fults Member of the Salem Limestone (Baxter, 1960a, p. 22-24) is named for Fults, Monroe County.
The type section of the Fults Member is in the bluffs three-fourths of a mile northwest of the town of Fults (SE NE 20, 4S-10W), where the member is 29.4 feet thick.
Extent and Thickness
The Fults Member is 25-34 feet thick in the outcrop area in Monroe and St. Clair Counties.
The Fults Member consists largely of thin- to medium-bedded, fine-grained, silty, cherty, more or less dolomitic limestone, but it contains beds of medium-grained limestone composed of fragmented fossils.
Globoendothyra baileyi and Eoendothyranopsis spiroides are common.
BAXTER, J. W., 1960a, Salem Limestone in southwestern Illinois: Illinois State Geological Survey Circular 284, 32p.
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