- Usage in publication:
-
- Northcraft formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Basalt
- Pyroclastics
- Conglomerate
- Sandstone
- AAPG geologic province:
-
- Oregon-Washington Coast Ranges province
Summary:
Named for typical exposures at Northcraft Mountain. Also typically exposed along road that parallels Salmon Creek in sec.2 and NW/4 sec.1 T15N R1W, Thurston Co, southwestern WA. [No type designated]. Consists of approximately 700 to 1000 ft of lava flows, pyroclastic rocks, flow-breccia and sedimentary rocks (conglomerate and sandstone) that conformably overlie McIntosh formation and are unconformably overlain by Skookumchuck formation (new). Contains no fossils; age is considered late Eocene because of stratigraphic position.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Northcraft Formation*
- Modifications:
-
- Revised
- Areal extent
- Biostratigraphic dating
- AAPG geologic province:
-
- Puget Sound province
Summary:
In Lake Tapps quad, Pierce Co, WA, unit consists of volcanic breccia and tuffs and lesser volcanic conglomerate and sandstone. Is 200 ft thick in the east to 2000 ft thick in the west. Can be traced southwestward to Centralia area. [Conformably] overlies Carbonado Formation; [conformably] underlies Spiketon Formation (new). These three formations compose Puget Group. Paleoflora identified by R.W. Brown is of Eocene age. Northcraft Formation in Lake Tapps quad is regarded as late Eocene in 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 ([ ]).