- Usage in publication:
-
- Shale Wall member*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
-
- Shale
- AAPG geologic province:
-
- Alaska Northern region
Summary:
Named as lower member (of 2) of Seabee formation of Colville group for Shale Wall Bluff. Name used in correlation chart by Tappan (1962). Type section designated as west bank of Nanushuk River at Camp W-June 25-47, Chandler River region, northern AK. Section extends 2.5 mi along river. Member extends as far south as 7 mi north of Tuktu Escarpment. Occurs in ridges. Is weak, incompetent bentonitic clay shale. Contains peculiar light-gray surficial shale "boils" produced as weathering phenomenon. Thickness is 1385 ft at type; here base cut by thrust fault. Unconformably overlies Ninuluk formation of Nanushuk group. Underlies Ayiyak member of Seabee formation. Report includes 7 columnar sections. Fossils from Shale Wall member are early Turonian age.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Shale Wall Member†
- Modifications:
-
- Abandoned
- AAPG geologic province:
-
- Alaska Northern region
Summary:
Pg. 5 (fig. 4), 6-8 (Table 1). †Shale Wall Member of Seabee Formation of †Colville Group. Abandoned. (†Colville also abandoned.) Seabee Formation is here restricted to rocks previously called Shale Wall Member. [See Seabee.]
Source: Publication.
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 ([ ]).