Historical:Tripp Limestone 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
Link Web page
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Lithostratigraphy: Hunton Limestone Megagroup >>Lingle Formation >>Tripp Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Devonian System >>Middle Devonian Series
Allostratigraphy: Kaskaskia Sequence

Authors

Charles Collinson and Elwood Atherton

Name Origin

The Tripp Limestone Member of the Lingle Formation (North, 1969, p. 25-28) overlies the Howardton Limestone Member and is named for Tripp School, 200 yards northwest of the type section.

Type Section

The type section of the Tripp Limestone Member is an outcrop on the south side of Kratzinger Hollow, 1 mile northwest of Jonesboro, Union County (N 1/2 NE NW 23, 12S-2W).

Extent and Thickness

The upper 17 feet of the member is exposed at the type section and 22-foot thicknesses are found in near-by wells. The Tripp is widespread and reaches 80 feet thick in south-central Illinois, although it is absent in southeastern Illinois (fig. D-15).

Description

The Tripp Member contains limestone, dolomite, chert, siltstone, and shale. It is largely cherty, argillaceous, silty limestone, but beds of shale are abundant near its base and top. About half of the member is dolomite on the margin of the Sparta Shelf. Glauconite, quartz sand, oolite, and beds of phosphate pellets are locally abundant in the northern and western parts of the member.

Fossils

Crinoids, brachiopods, and corals are abundant in some Tripp Member beds.

References

NORTH, W. G., 1969, Middle Devonian strata of southern Illinois: Illinois State Geological Survey Circular 441, 45 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
6050
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