- Usage in publication:
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- Mount Kelly Graywacke Tongue*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
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- Graywacke
- AAPG geologic province:
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- Alaska Northern region
Summary:
Named for characteristic development on Mount Kelly, sec.21 T11S R50W [DeLong Mountains 1:250,000 quad] DeLong Mountains, western Brooks Range, northern AK, designated its type locality. Is part of Fortress Mountain Formation. Rocks previously included in Fortress Mountain Formation (Chapman and Sable, 1960). Characterized by its distinctive calcareous, micaceous graywacke. No sections have been measured; however, it may be as much as several hundred m in thickness. Base of tongue seems to be unconformity. Appears to be gradational and to interfinger with overlying Torok Formation. Age is Aptian and Albian (late Early Cretaceous) based on flora collected near center of unit at locality south of Poko Mountain.
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 ([ ]).