Historical:Bilyeu Member
Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Borden Siltstone >>Bilyeu Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series
Allostratigraphy: Kaskaskia Sequence
Authors
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
Name Origin
The Bilyeu Member of the Borden Siltstone (Lineback, 1968a, p. 5) is named for Bilyeu Cemetery, Christian County, about 2 miles north of the type section.
Type Section
The type section of the Bilyeu Member is in the National Petroleum Company No. 1-A Bilyeu, Haldon et al., south well (NW NW SW 10, 13N-1E), where the member is 102 feet thick, extending from 1616 to 1718 feet deep.
Extent and Thickness
The Bilyeu is 0-150 feet thick and extends in the subsurface through Piatt, De Witt, Macon, Christian, Montgomery, Sangamon, and parts of adjacent counties in central Illinois. The Bilyeu Member extends westward beyond the eastern pinchout of the Burlington and Keokuk Limestones and, therefore, in that area is a member of the Warsaw Shale.
Description
The Bilyeu consists of siltstone that is coarser than most of the Borden and also of fine sandstone.
References
LINEBACK, J. A., 1968a, Subdivisions and depositional environments of New Albany Shale (Devonian-Mississippian) in Indiana: American Association of Petroleum Geologists Bulletin, v. 52, p. 1291-1303.
ISGS Codes
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