- Usage in publication:
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- Amberg Granite
- Modifications:
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- Areal extent
- Dominant lithology:
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- Granite
- AAPG geologic province:
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- Wisconsin arch
Summary:
Pg. 5. Amberg Granite. Nine rock units mapped in northeastern Wisconsin, within some 350 sq mi of the Precambrian granitic and metamorphic complex. Relative age-relationships are suggested primarily from study of xenoliths, as follows (ascending): Quinnesec Formation, biotite gneiss, Marinette Quartz Diorite (new), Twelve Foot Falls Quartz Diorite (new), metagabbro sills, Hoskin Lake Granite (new), Newingham Granite, Amberg Granite (new), and diabase dikes.
Source: US geologic names lexicon (USGS Bull. 1350, p. 21-22).
- Usage in publication:
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- Amberg Granite
- Modifications:
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- Principal reference
- Dominant lithology:
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- Granite
- AAPG geologic province:
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- Wisconsin arch
Summary:
Pg. 7-14. Amberg Granite. A review of some problems of Precambrian geology of northeastern Wisconsin. In Pembine-Amberg area, eight rock units younger than Quinnesec Formation are recognized and mapped. Five of these units are named. Amberg Granite is next to the youngest unit. Younger than Newingham Granodiorite; older than unnamed diabase dikes. Tentatively correlated with High Falls Granite of Mancuso.
Source: US geologic names lexicon (USGS Bull. 1350, p. 21-22).
- Usage in publication:
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- Amberg Granite
- Modifications:
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- Areal extent
- AAPG geologic province:
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- Wisconsin arch
Summary:
Pg. 57-60. Amberg Granite. Described in Athelstane area [Marinette County, northeastern Wisconsin]. Generally unaltered and undeformed appearance of main Amberg mass suggests that unit is younger than other granitic units to north. Relative ages of the several gray and pink varieties of Amberg Granite have not been established completely. Since outcrops of pink granite can be traced from High Falls reservoir to Amberg, it seems clear that Amberg Granite and High Falls Granite are part of the same mass. Age is Precambrian.
Source: US geologic names lexicon (USGS Bull. 1350, p. 21-22).
- Usage in publication:
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- Amberg Granite
- Modifications:
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- Areal extent
- AAPG geologic province:
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- Wisconsin arch
Summary:
Pg. 91-103. Amberg Granite. Described in Pembine area [Marinette County, northeastern Wisconsin] where northernmost exposures are present. Marginally, a medium- to fine-grained gray granite crops out; but further south, the typical medium- to coarse-grained pink Amberg Granite apparently the medium-grained gray border phase. Age is Precambrian.
Source: US geologic names lexicon (USGS Bull. 1350, p. 21-22).
- Usage in publication:
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- Amberg Quartz Monzonite
- Modifications:
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- Redescribed
- Dominant lithology:
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- Quartz monzonite
- AAPG geologic province:
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- Wisconsin arch
Summary:
Amberg Granite redescribed. Name changed to Amberg Quartz Monzonite. Rb-Sr dating of unit is 1613 +/-42 Ma.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Amberg Quartz Monzonite*
- Modifications:
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- Overview
- AAPG geologic province:
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- Lake Superior region
Summary:
Amberg Quartz Monzonite. Present in northern Wisconsin as one of several mesozonal quartz monzonitic plutons in the Wisconsin magmatic zone. Believed to be deep-seated equivalent of granitic rocks in the Fox River Valley. Age of igneous activity estimated at 1760 Ma based on radiometric data available. Age is Early Proterozoic.
Source: Modified from GNU records (USGS DDS-6; Denver 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 ([ ]).