- Usage in publication:
-
- Norrie ferruginous chert member
- Modifications:
-
- Named
- Dominant lithology:
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- Chert
- AAPG geologic province:
-
- Wisconsin arch
Summary:
Named the Norrie ferruginous chert member of the Ironwood formation for Norrie mine, Gogebic Co., MI. Consists almost wholly of wavy-bedded granular and fine-grained ferruginous chert with hematite in beds and grains. Thickness is 30 to 230 feet. Unit conformably overlies the Yale member of the Ironwood and unconformably underlies the Pence ferruginous slate member of the Ironwood. The Norrie is of Precambrian age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Norrie Member*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Wisconsin arch
Schmidt, R.G., and Hubbard, H.A., 1972, Penokean orogeny in the central and western Gogebic region, Michigan and Wisconsin: [unknown]
Summary:
Revised the Norrie to the Norrie Member of the Ironwood Iron-Formation. Consists of mostly thick- and wavy-bedded cherty iron-formation. Overlies the Yale Member and underlies the Pence Member. The Norrie is of Precambrian X age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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 ([ ]).