- Usage in publication:
-
- Port Clarence limestone*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Seward Peninsula province
- Alaska West-Central region
Summary:
Named as basal unit (of 2) of Nome series for outcrops north of Port Clarence, Seward Peninsula, west-central AK. Occupies large area including York Mountains near western extremity of peninsula. Consists of blue and gray, slightly indurated, gray, earthy limestone; basal beds are flaggy and slightly schistose. Near contact with conformably overlying Kugruk group Port Clarence is flaggy and intensely folded. Is at least 2000 ft thick in York Mountains. Unconformably(?) overlies Kuzitrin series. Fossils (listed with localities) identified by Charles Schuchert are Early Silurian in age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Port Clarence Limestone†
- Modifications:
-
- Abandoned
- AAPG geologic province:
-
- Seward Peninsula province
- Alaska West-Central region
Summary:
Port Clarence Limestone, designation abandoned because unit was expanded to include rocks ranging in age from late Precambrian through Mississippian. In this report, each limestone unit is [informally] referred only to system represented. Nome Group is restricted to rocks of Precambrian age and consists of schist and metamorphosed gabbroic rocks excluding marble and limestone of Paleozoic and latest Precambrian 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 ([ ]).