Jamestown limestone member of McLeansboro formation. Dark-blue limestone, 2.5 feet thick, containing PRODUCTUS sp. Top lies 4.5 to 7 feet below Bankston Fork limestone member and base lies 18+/- feet above Herrin (No. 6) coal in vicinity of Pinckneyville and Jamestown, Perry County, southwestern Illinois. Age is Pennsylvanian. Typically exposed in vicinity of Jamestown.
Source: US geologic names lexicon (USGS Bull. 896, p. 1040).
Pg. 17 (fig. 3). Jamestown limestone of McLeansboro group. Shown on columnar section as limestone in McLeansboro group; stratigraphically below Anvil Rock sandstone and above Herrin limestone. Present in southwestern Illinois. Age is Pennsylvanian.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1910).
Pg. 10. Jamestown limestone. Shown on correlation chart as limestone in Jamestown cyclothem at top of Carbondale group. Type locality given.
In NW/4 NE/4 sec. 34, T. 5 S., R. 4 W., in vicinity of Jamestown, Perry Co., southern IL.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1910).
Pg. 35, 54 (table 3). Jamestown limestone. Replaced with Conant limestone member (new) of Carbondale formation of Kewanee group (new). Name Jamestown will be used for the coal beneath the limestone. Presentation of new rock-stratigraphic classification of Pennsylvanian strata in Illinois; cyclical classification is independent of rock-stratigraphic classification.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1910).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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