Historical:Blomeyer 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: Ottawa Limestone Megagroup >>Platteville Group >>Plattin Subgroup >>Mifflin Formation >>Blomeyer Member
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Blackriveran Stage
Allostratigraphy: Tippecanoe Sequence


H. B. Willman and T. C. Buschbach

Name Origin

The Blomeyer Member of the Mifflin Formation (Templeton and Willman, 1963, p. 80) is named for Blomeyer, Cape Girardeau County, Missouri, about 6 miles southwest of the type section.

Type Section

The type section of the Blomeyer Member is located in a small quarry a quarter of a mile east of the highway junction at Rock Levee (NW cor. NE NW 24, 30N-13E), where the member is 12.1 feet thick.

Extent and Thickness

The Blomeyer is irregularly present, but it is as much as 15 feet thick in subsurface in southern Illinois. It is less than a foot to 3 feet thick in the northern outcrop area.


The Blomeyer consists of argillaceous, fine-grained limestone, or locally dolomite, that weathers thin-bedded to shaly.


TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation