Hall Limestone Member

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Lithostratigraphy: McLeansboro Group >>Modesto Formation >>Hall Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka 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)

M. E. Hopkins and J. A. Simon

Name

Original description

The Hall Limestone Member of the Modesto Formation (Willman, in Cooper, 1946, p. 12).

Derivation

Named for Hall Township, Bureau County.

Other names

History/background

Type section

Type location

The type section consists of exposures in a ravine west of the coal mine refuse pile in the western part of the town of Spring Valley (NW SW 33, 16N-11E) (Wanless, 1956, p. 12).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

In the type section it lies about 45 feet below the La Salle Limestone Member.

Extent and thickness

The Hall is recognized only in northern Illinois.

Lithology

At the type section, it consists of a 3-foot ledge of fine-grained, green, gray, and red limestone containing numerous brachiopods, crinoid columnals, and bryozoans. It is underlain by a persistent black shale.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Age and correlation

The Hall is correlated with the Macoupin Limestone of southern and eastern Illinois.

Environments of deposition

Economic importance

Remarks

References

COOPER, C. L., 1946, Pennsylvanian ostracodes of Illinois: Illinois State Geological Survey Bulletin 70, 177 p. WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
2160
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