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National Geologic Map Database
Geologic Unit: Wales
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Map showing publication footprint
  • Usage in publication:
    • Wales series*
  • Modifications:
    • Named
  • Dominant lithology:
    • Argillite
    • Limestone
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska: U.S. Geological Survey Professional Paper, 1, 120 p.


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).


Map showing publication footprint
  • Usage in publication:
    • Wales Group*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Eberlein, G.D., and Churkin, Michael, Jr., 1973, New evidence bearing on age of Wales Group, IN Geological Survey Research 1973: U.S. Geological Survey Professional Paper, 850, p. 72.


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).


Map showing publication footprint
  • Usage in publication:
    • Wales Group*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map, MF-2319, 1 sheet, 53 p., scale 1:250,000


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).


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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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).