- Usage in publication:
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- Freedhem tonalite
- Modifications:
-
- Original reference
- Dominant lithology:
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- Tonalite
- AAPG geologic province:
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- Sioux uplift
Summary:
Pg. 1002, 1009, 1010, pl. 1. Metatonalite to granodiorite, tonalite most common; black to light-gray, fine to medium granitoid, weak primary foliation. One of five major intrusives in late Algoman; these cannot be shown to be members of a single magma series; age relations of the named intrusives, St. Cloud gray granodiorite, Hillman tonalite, Freedhem tonalite, and Warman quartz monzonite are indeterminate because no contacts are exposed.
Name applied because most of its outcrops are around town of Freedham, Morrison Co., central MN.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1424).
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 ([ ]).