Glen Park Formation

Jump to navigation Jump to search

Lithostratigraphy: Knobs Megagroup >>New Albany Shale Group >>Glen Park Formation
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Kinderhookian Series
Allostratigraphy: Kaskaskia Sequence

Primary source

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.

Contributing author(s)

Elwood Atherton, Charles Collinson, and Jerry A. Lineback


Original description

"Glen Park" Formation (Ulrich, 1904, p. 110; Moore, 1928, p. 138-140).


Named for Glen Park Station about 25 miles south of St. Louis, Jefferson County, Missouri.

Other names

Stuart Weller (1914, p. 464-467) gave the name "Hamburg Oolite" to exposures of the oolitic limestone at Hamburg that he considered to be younger than the type Glen Park, but the name was preempted and Moore (1928) redefined the name "Glen Park" to include the strata at Hamburg. However, studies of the conodonts indicate that the two units are not of the same age- the type Glen Park being Devonian and the Hamburg strata Mississippian- but the name "Glen Park" has been retained pending introduction of a new name.


Type section

Type location

The type section of the "Glen Park" Formation is located near Glen Park Station, where 1.4 feet of fossiliferous oolitic limestone was named Glen Park.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The "Glen Park" rests with apparent erosional contact on the Louisiana Limestone, or on the Saverton Shale where the Louisiana is not present. However, no unconformity is generally recognizable where the "Glen Park" is absent.

Extent and thickness

The "Glen Park" is exposed in and near the Mississippi River bluffs in Calhoun, Pike, and Jersey Counties, and in the lower Illinois Valley in Calhoun and Jersey Counties. It is restricted to western Illinois where its thickness varies greatly but does not exceed 25 feet in the outcrop area. Much of the thick brown shale included in the "Glen Park" by Workman and Gillette (1956) is now included in the Hannibal Shale.


The lithology of the "Glen Park" varies considerably and may be almost any combination of sandy, silty, brown or buff limestone, buff siltstone, silty shale, oolitic limestone, limestone conglomerate, or thin sandstone beds. In Gresham Hollow, about a mile southeast of Hamburg, Calhoun County (NW 1 , 10S-3W), it consists of calcareous, blue-gray siltstone overlying light gray to buff, silty, dense, fine-grained limestone. The limestone contains beds of dolomitic siltstone bearing Tasmanites and also lenses of highly fossiliferous, white to buff, conglomeratic, oolitic, cross-bedded limestone. Stuart Weller (1906b) described the fauna.




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



MOORE, R. C., 1928, Early Mississippian formations in Missouri: Missouri Bureau of Geology and Mines, v. 21, 283 p.
ULRICH, E. O., 1904, in E. R. Buckley and H. A. Buehler, Quarrying industry of Missouri: Missouri Bureau of Geology And Mines, v. 2, 371 p.
WELLER, STUART, 1906b, Kinderhook faunal studies--4. Fauna of the Glen Park limestone: St. Louis Academy of Science Transactions, v. 16, p. 435-471.
WELLER, STUART, 1914, Mississippian Brachiopoda of the Mississippi Valley Basin: Illinois State Geological Survey Monograph I, part I, 508 p.; part 2, 187 p.
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.

ISGS Codes

Stratigraphic Code Geo Unit Designation