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- Usage in publication:
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- Berg Creek Formation*
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
- Conglomerate
- AAPG geologic province:
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- Alaska Southern region
Summary:
Type section: exposures extend south from SE/4 SW/4 sec.34 T3S R9E to SE/4 NW/4 sec.3 T4S R9E from west of Berg Creek to 1.8 km south of Kuskulana Pass, McCarthy C-8 quad, Wrangell Mountains, AK. Consists of massive to medium-bedded, cross-bedded, fossiliferous, near-shore marine deposits of light-gray, brown, greenish-gray, and buff bioclastic sandy limestone with conglomerate. Is 250 m thick. Unconformably overlies Triassic rocks or nonconformably overlies Chitina Valley batholith (Late Jurassic); gradationally underlies Kuskulana Pass Formation. Age is Hauterivian or Hauterivian and Barremian (Early Cretaceous) on basis of marine megafossils.
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 ([ ]).