National Geologic Map Database

Geologic Unit: Morton


Morton Tongue of Peoria Silt of Mason Group (IL*-subsurface)
Morton Tongue of Peoria Loess Member of Atherton Formation (IN)

Geologic age:

Pleistocene (Wisconsinan Age)*

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

Type section [no longer exposed, ca. 1996]: Farm Creek RR cut section, 6 mi (9.6 km) northwest of Morton, in center sec. 31, T. 26 N., R. 3 W., Tazewell Co., central northern IL. Named from village of Morton, Tazewell Co., central northern IL (Frye and Willman, 1960; see Hansel and Johnson, 1996).
Principal reference sections (Hansel and Johnson, 1996):
(1) Danvers (Rock Creek) section, in cutbank on south side of Rock Creek, in NW/4 NE/4 NW/4 sec. 32, T. 25 N., R. 1 W., Danvers 7.5-min quadrangle, Woodford Co., IL;
(2) Farm Creek section, on south side of Farm Creek, in NE/4 SW/4 SE/4 sec. 30, T. 26 N., R. 3 W., Washington 7.5-min quadrangle, Tazewell Co., IL;
(3) Gardena section, exposed in stream bank 99 ft (30 m) west (downstream) of Toledo, Peoria, and Western RR bridge, in NW/4 SW/4 NW/4 sec. 32, T. 26 N., R. 3 W., Washington 7.5-min quadrangle, Tazewell Co., IL;
(4) Glendale School section, in north valley wall of a minor tributary of Farm Creek, in SE/4 SW/4 NE/4 sec. 3, T. 25 N., R. 4 W., Peoria East 7.5-min quadrangle, Tazewell Co., IL.

AAPG geologic province:

Illinois basin*

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).