- Usage in publication:
-
- Stambaugh formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Slate
- Iron-formation
- AAPG geologic province:
-
- Lake Superior region
Summary:
Named for scattered exposures at Stambaugh High School in town of Stambaugh, in the Iron River-Crystal Falls district, southern Iron Co, MI in the Lake Superior region. Is part of Paint River group (new) of Animikie series. Are iron-rich rocks that range from [meta-] chlorite mudstone and slate to a laminated, cherty siderite-magnetite rock. Referred to locally as magnetic slate. Is uniquely magnetic over most of district and traceable through magnetic surveying. Better exposures in eastern part of district. Underlain by Hiawatha graywacke (new) and overlain by Fortune Lakes slate (new). Stratigraphic sequence chart. Is middle Precambrian in age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Stambaugh Formation*
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Lake Superior region
Summary:
Pg. 2845 (fig. 2, stratigraphic chart compiled from Leith and others, 1935; James, 1958; Gair and Thaden, 1968). Stambaugh Formation of Paint River Group of Marquette Range Supergroup (new; replaces †Animikie series of James, 1958, south of Lake Superior, in Michigan and Wisconsin). Present in Iron River-Crystal Falls district, northwestern Michigan. Overlies Hiawatha Graywacke and underlies Fortune Lakes Slate, both of Paint River Group. Age is middle Precambrian.
Source: Publication.
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 ([ ]).