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Revision as of 17:33, 13 July 2020


Type and Reference Sections of Named Units

A. Principal Reference Section of the Houchin Creek Coal Member, Carbondale Formation

From an unpublished manuscript by Wier (1961, locality 6): Highwall on north side of abandoned strip mine, SE NE SW, Sec. 3, T3S, R7W, Pike County, Indiana. Map of Wier and Stanley (1952) identifies the site as the Blackfoot Mine.

4.0' Shale, light to medium gray, thin- to medium-bedded
1.5' Shale, dark gray to black, slightly calcareous, scattered crinoid columnals and small brachiopods, nodules and thin lenses of gray to tan, finely crystalline limestone
0.9' Shale, black, fissile
1.2' Hanover Limestone Member (Stendal Limestone of Wier), black, dense, argillaceous, few fossils (not named), contains lenses of dark gray to tan limestone that is fossiliferous. Unit is lenticular, varies from 0 to 2 feet [0 to 0.6 m] thick.
2.2' Excello Shale Member, black, fissile, alternating hard and soft layers
0.5' Houchin Creek Coal Member, bright banded
5.3' Claystone, light gray, scattered rootlets
4.0' Shale, light gray, weathers brown, sandy
1.2' Sandstone, medium gray, silty, calcareous, single bed
28.0' Sandstone, light gray, fine grained, shaly, mostly thin- to medium-bedded, interlaminated gray sandy shale contains siderite bands. Base under water, close to top of Survant Coal Member, which was mined. Wier and Stanley (1952) report average Survant Coal thickness 2.4 feet at this mine.
Total section 48.8 ft (14.9 m).

B. Type Section of the Hanover Limestone Member

Field notes by S.E. Ekblaw, September 8, 1930: ravine south of road east of Hanover School, SW NW SE and NE SW SE, Sec. 27, T10 N, R11W, Greene County, Illinois. Illinois State Geological Survey, Map Room, open files.

4'± Hanover Limestone Member, brownish to bluish gray, nodular structure with brecciated character, massive, in one or two beds. Abundant blue-gray to black nodules in places. Fossils include crinoids, Composita, Squamularia, fusulinids.
8" Shale, greenish gray, slightly calcareous.
2'± Covered
6" Clay-shale, bluish gray, noncalcareous.
2" Shale, coaly.
2½" Clay shale, dark bluish-gray, noncalcareous, poorly bedded, very slickensided, no fossils.
1' 6" to 2' 8" Houchin Creek Coal Member
1' Claystone, black, shaly, leafy.
2" Claystone, gray, noncalcareous.
2' Shale, gray, noncalcareous, evenly bedded, fern leaf and stem impressions.

C. Type Section of the Delafield Member (New)

From continuous core of Energy Plus borehole no. ME-13, drilled 2,605 ft (794 m) from south line, 1,274 ft (388 m) from west line, Sec. 31, T4S, R6E, Hamilton County, Illinois. Core described by W. John Nelson, January 4–5, 2007.

D. Type Section of the Galatia Member (New)

Core from Kerr-McGee Corp. borehole # 7629-16 (Sec. 29, T7S, R6E, Saline County, Illinois). This core is in permanent storage at the Samples Library of the Illinois State Geological Survey in Champaign (storage number C-14933).

Primary Source

Nelson, W.J., S.D. Elrick, W.A. DiMichele, and P.R. Ames, 2020, Evolution of a peat-contemporaneous channel: The Galatia channel, Middle Pennsylvanian, of the Illinois Basin: Illinois State Geological Survey, Circular 605, 85 p., 6 pls.