- Usage in publication:
-
- Skwentna series*
- Modifications:
-
- Named
- Dominant lithology:
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- Volcanics
- Tuff
- Slate
- Arkose
- AAPG geologic province:
-
- Alaska Southwestern region
Summary:
First encountered on Skwentna River 10 or 15 mi above junction with Yentna River, then on right bank of Skwentna some mi below mouth of Hayes River, southwestern AK. Consists of ancient volcanic rocks interstratified with tuffs and derived slates and some arkoses all highly folded. On east side of Tordillo Mountains, Skwentna conformably underlies Tordrillo series (new); on west side Terra Cotta series (new) underlies Tordrillo series. Skwentna is assigned to Jurassic(?) age on basis of possible correlation with Naknek series (new).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Skwentna group*
- Modifications:
-
- Redescribed
- Areal extent
- Age modified
- AAPG geologic province:
-
- Alaska Southwestern region
- Alaska Southern region
Summary:
Skwentna series of Spurr (1900) here called Skwentna group. [Type area interpreted by Brooks to be valley of Skwentna River]. Believed to extend southward as far as Mount Spurr as shown on geologic map of Mount McKinley region. Provisionally correlated with Matanuska and Talkeetna area. Fossils obtained by Sidney Paige and Adolph Knopf in Matanuska basin from sedimentary deposits provisionally correlated with Skwentna group indicate probable early Middle Jurassic(?) age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Skwentna group*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Alaska Southwestern region
Martin, G.C., 1926, Mesozoic stratigraphy of Alaska: U.S. Geological Survey Bulletin, 776, 493 p.
Summary:
Age is Early Jurassic(?) on basis of stratigraphic position and correlation. Historical review of work of earlier authors included.
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 ([ ]).