Historical:Fults Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Salem Limestone >>Fults Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series
Allostratigraphy: Kaskaskia Sequence


Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name Origin

The Fults Member of the Salem Limestone (Baxter, 1960a, p. 22-24) is named for Fults, Monroe County.

Type Section

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.

ISGS Codes

Stratigraphic Code Geo Unit Designation