Usage:
Blue Earth siltstone beds [informal] of Oneota Dolomite of Prairie du Chien Group (MN)
Considered informal. The rank or lithologic term should not be capitalized.
Geologic age:
Early Ordovician (Ibexian; Tremadocian)
Type section, locality, area and/or origin of name:
Because of historical significance of term "Blue Earth," this siltstone is called Blue Earth Siltstone Bed. It occurs for some distance up Blue Earth River, Le Sueur Co., southeastern MN (Powell, 1935).
AAPG geologic province:
Sioux uplift
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 ([ ]).