Usage:
Schrader Bluff Formation (AK*)
Geologic age:
Late Cretaceous (Santonian to Maastrichtian)*
Type section, locality, area and/or origin of name:
Type section: Schrader Bluff on Anaktuvuk River, about 5 mi above mouth of Tuluga River, east of Umiat, in sec. 30, T. 3 S., R. 5 E., [approx. Lat. 69 deg. 09 min. 24 sec. N., Long. 151 deg. 01 min. 24 sec. W., Umiat A-2 quadrangle, scale 1:63,360], northern AK (Gryc and others, 1951; Mull and others, 2003).
Reference sections (middle part): (1) Schrader Bluff type section, on Anaktuvuk River, about 5 mi above mouth of Tuluga River, east of Umiat, in sec. 30, T. 3 S., R. 5 E., [approx. Lat. 69 deg. 09 min. 24 sec. N., Long. 151 deg. 01 min. 24 sec. W., Umiat A-2 quadrangle, scale 1:63,360], northern AK; and (2) Shivugak Bluff on north side of Colville River, 10 mi downstream from Umiat, in sec. 19, T. 1 N., R. 2 E., [approx. Lat. 69 deg. 25 min. 48 sec. N., Long. 151 deg. 42 min. 42 sec. W., Umiat B-3 quadrangle, scale 1:63,360], northern AK (Mull and others, 2003).
AAPG geologic province:
Alaska Northern region*
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 ([ ]).