Usage:
Morton Gneiss (MN*)
Morton Gneiss of Minnesota Valley Group (MN)
Geologic age:
Precambrian
Archean, Early
Archean, Middle
Archean, Late
Type section, locality, area and/or origin of name:
Type locality not stated. Named from occurrence in vicinity of Morton, Renville Co., southwestern MN. Extends from near New Ulm, Brown Co., to a point south of Sacred Heart, Renville Co., a distance of about 50 mi (Thiel and Dutton, 1935).
AAPG geologic province:
Lake Superior region*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).