U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Gila
Map showing publication footprint
  • Usage in publication:
    • Gila limestone
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Illinois basin
Publication:

Newton, W.A., and Weller, J.M., 1937, Stratigraphic studies of Pennsylvanian outcrops in part of southern Illinois: Illinois Geological Survey Report of Investigations, no. 45, 31 p.


Summary:

Pg. 28. Gila limestone. Present in southeastern Illinois. Dense fine-grained brittle limestone that contains small fragments of carbonaceous material; medium-gray, weathers nearly white. Thickness 1 to 4 inches. Included in Gila cyclothem. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1504).


Map showing publication footprint
  • Usage in publication:
    • Gila limestone
  • Modifications:
    • Principal reference
    • Revised
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956, [with Correlation chart compiled by Raymond Siever]: Illinois Geological Survey Circular, no. 217, 14 p.


Summary:

Pg. 12, pl. 1. Gila limestone of McLeansboro group. Correlation chart shows Gila limestone in McLeansboro group below Woodbury limestone and above Greenup limestone. Age is Pennsylvanian. Gives type locality same as Gila cyclothem.
Type locality: along Mint Creek, in NE/4 SW/4 sec. 31, T. 8 N., R. 9 E., [southeast of Gila], Jasper Co., southeastern IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1504).


Map showing publication footprint
  • Usage in publication:
    • Gila limestone member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Illinois basin
Publication:

Kosanke, R.M., Simon, J.A., Wanless, H.R., and Willman, H.B., 1960, Classification of the Pennsylvanian strata of Illinois: Illinois Geological Survey Report of Investigations, no. 214, 84 p.


Summary:

Pg. 40, 51 (table 1), pl. 1. Gila limestone member of Mattoon formation of McLeansboro group. Reallocated to member status in Mattoon formation
(new). Occurs above Greenup limestone member and below Woodbury
limestone member. Presentation of new rock-stratigraphic classification of Pennsylvanian strata in Illinois. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1504).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 04:40:46 PM MDT