- Usage in publication:
-
- Ogotoruk Formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Siltstone
- Sandstone
- AAPG geologic province:
-
- Alaska Northern region
Summary:
Named for exposures along Ogotoruk Creek and its tributaries southwest side of Lisburne Peninsula, northern AK, which is designated its type locality. Consists chiefly of dark-gray mudstone interbedded with variable amounts of siltstone and very fine- to medium-grained dark-gray and brown sandstone. Just east of Agate Rock lower part consists of several ft of dark greenish-gray claystone; conspicuous red-weathering layer occurs 3 ft above base. Is estimated to be about 5000 ft thick. East of Agate Rock disconformably overlies Shublik Formation; elsewhere base is concealed. Gradationally underlies Telavirak Formation (new). Assigned Jurassic or Cretaceous age based on correlation.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Ogotoruk Formation*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Alaska Northern region
Summary:
Correlation chart shows Ogotoruk Formation on Lisburne Peninsula is Oxfordian to early Tithonian (Late Jurassic) Age.
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 ([ ]).