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Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
The Chalfin Member of the Salem Limestone (Baxter, 1960a, p. 24-27).
Named for the village of Chalfin Bridge, Monroe County.
The type section of the Chalfin Member is in the Mississippi River bluffs 1 mile southwest of the village of Chalfin Bridge (NE SW 7, 4S-10W), where the member is 39.5 feet thick.
The Chalfin is 26-57 feet thick in the outcrop area.
The Chalfin consists of varying thicknesses of fine-grained limestone; fine- to medium-grained, fossiliferous, locally oolitic limestone; and semilithographic limestone, some of it brecciated. The lower 10 feet is predominantly a calcarenite composed of bryozoan detritus, crinoid columnals, microcrystalline pellets, and a few oolites.
''Eoendothyranopsis'' group ''pressus-rarus, Koninckopora sahariensis, K. inflata, Septabrunsiina'', and profuse ''Calcisphaera'' characterize the Chalfin.
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BAXTER, J. W., 1960a, Salem Limestone in southwestern Illinois: Illinois State Geological Survey Circular 284, 32
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