- Usage in publication:
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- Wales series*
- Modifications:
-
- Named
- Dominant lithology:
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- Argillite
- Limestone
- AAPG geologic province:
-
- Alaska Southeastern region
Summary:
Unit is named the Wales series. Forms belt of argillites and limestones extending in northwest-southeast direction. Argillaceous part includes clay slates and phyllites. Limestone is typically white or bluish white, crystalline, and often dolomitic. Limestone is associated with basic intrusive sills and dikes. Thickness is probably several 1000 ft. Unconformably underlies Vallenar series. Age is believed to be Silurian. Map legend shows early Paleozoic(?) age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
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- Wales Group*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Alaska Southeastern region
Summary:
Wales Group consists of a thick, heterogeneous, mainly volcanogenic assemblage of low grade (greenschist and semischist) polymetamorphic rocks with interstratified marble. Age is pre-Middle Ordovician based on stratigraphic relations to overlying unmetamorphosed beds containing Middle Ordovician graptolites. Wales Group may be at least as old as Cambrian and probably Precambrian.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Wales Group*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Alaska Southeastern region
Summary:
Age of the Wales Group is revised (everywhere) from pre-Middle Ordovician to: Late Proterozoic and Early Cambrian(?).
Source: GNU records (USGS DDS-6; Menlo 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 ([ ]).