Geologic Unit: Henry

Usage:

Henry Formation of Mason Group (IL*)

Subunits:

(alphabetical) --all in IL*: Ashmore Tongue, Batavia facies (informal), Beverly Tongue, Dolton facies (informal), Mackinaw facies (informal), Parkland facies (informal), Ravinia facies (informal), Wasco facies (informal).

Geologic age:

Pleistocene (Wisconsinan Age); uppermost part considered Holocene*

Type section, locality, area and/or origin of name:

Type section [no longer exposed, ca. 1996]: gravel pit along IL Highway 29, 2 mi (3.2 km) north of Henry, in SE/4 SE/4 sec. 32, T. 14 N., R. 10 E., Putnam Co., north-central IL. Named from village of Henry, Marshall Co., north-central IL (Willman and Frye, 1970; see Hansel and Johnson, 1996).
Principal reference sections (Hansel and Johnson, 1996):
(1) Beverly sand and gravel pit section, in the Beverly sand and gravel pit, about 1.5 mi (2.4 km) east of intersection of I-90 and IL Highway 25 northeast of Elgin, in sec. 31, T. 42 N., R. 9 E., Streamwood 7.5-min quadrangle, Cook Co., IL;
(2) Wedron section, in highwalls of pits in Wedron Silica Company quarries, in secs. 8, 9, 10, and 16, T. 34 N., R. 4 E., Wedron 7.5-min quadrangle, La Salle Co., IL;
(3) Charleston section, in south wall of Charleston stone quarry, approx. 500 ft (152 m) west of Embarrass River and 100 ft (30 m) north of RR tracks, in SW/4 NW/4 sec. 5, T. 12 N., R. 10 E., Ashmore 7.5-min quadrangle, Coles Co., east-central IL.

AAPG geologic province:

Illinois basin*
Michigan basin*
Wisconsin arch*