Starrs Cave Limestone
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
Starrs Cave Limestone (Collinson, in Workman and Gillette, 1956, p. 31).
Named for Starrs Cave on the Flint River near Burlington, Iowa.
The type section of the Starrs Cave Limestone, Starrs Cave on the Flint River near Burlington, Iowa, consists of 2.7-3.5 feet of oolitic, very light gray limestone containing many brachiopods and corals (NW NW 19, 70N-2W). Laudon (1931) referred to this unit as the Schellwienella Zone.
The Starrs Cave Limestone is the uppermost formation in the North Hill Group. It conformably overlies the Prospect Hill Siltstone and is unconformably overlain by the Burlington Limestone.
Extent and thickness
In Illinois the Starrs Cave occurs only in western Hancock County (fig. M-9), where it is 2-12 feet thick but is not exposed.
The Starrs Cave is a buff to light brownish gray, coarsely oolitic, locally dolomitic limestone.
Well log characteristics
The Starrs Cave has an abundant macrofauna dominated by brachiopds.
Age and correlation
The Starrs Cave is correlated with the Chouteau Limestone (Collinson, 1961).
Environments of deposition
COLLINSON, CHARLES, 1961, Kinderhookian Series in the Mississippi Valley, in Northeastern Missouri and west-central Illinois: Kansas Geological Society Guidebook, 26th Annual Field Conference, Missouri Geological Survey Report of Investigations 27, p. 100-109; Illinois State Geological Survey Reprint 1961-U.
LAUDON, L. R., 1931, Stratigraphy of the Kinderhook Series of Iowa: Iowa Geological Survey, v. 35, p. 333-451.
WORKMAN, L. E., and TRACEY GILLETTE, 1956, Subsurface stratigraphy of the Kinderhook Series in Illinois: Illinois State Geological Survey Report of Investigations 189, 46 p.
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