Chart 6 (column 29). Shown on correlation chart as Hall limestone in McLeansboro formation. Occurs below LaSalle limestone and above Hicks limestone (new). Age is Pennsylvanian. Present in northern Illinois.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1648).
Pg. 39, 50 (table 1). Hall limestone of McLeansboro group. Age is Pennsylvanian. Included in Hall cyclothem. Type locality given.
Type locality: in NW/4 SW/4 sec. 33, T. 16 N., R. 11 E., Bureau Co., northern IL.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1648).
Pg. 39, 50 (table 1). Hall limestone member of Bond formation (new) of McLeansboro group. Reallocated to member status in Bond formation. Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Pennsylvanian strata in Illinois.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1648).
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 ([ ]).