Chart no. 6 (column 29, northern Illinois, collated by H.R. Wanless and J.M. Weller). Shown on Pennsylvanian correlation chart as Hall limestone [unranked] in McLeansboro formation. Occurs below LaSalle limestone and above Hicks limestone (new), [both unranked units in Mcleansboro formation]. Age is [Late Pennsylvanian]; Missourian; Stephanian.
[Shown on chart correlative with Graysville limestone (unranked) in Wabash formation in Indiana (col. 25), Macoupin limestone (unranked) in McLeansboro formation in central Illinois (col. 28), and Westerville limestone of Kansas City group in Iowa, Missouri, Kansas and Nebraska (cols. 31-33, collated by R.C. Moore).]
Source: Publication; 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.
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