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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Berg Creek Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Conglomerate
  • AAPG geologic province:
    • Alaska Southern region
Publication:

MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map, GQ-1418, scale 1:63,360


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