Usage:
Cantwell Formation (AK*)
Geologic age:
Late Cretaceous to early Tertiary (Campanian to Eocene)*
Type section, locality, area and/or origin of name:
East wall of canyon of Nenana River [formerly Cantwell River], from mouth of Slime Creek, northward 7 or 8 mi, Healy C-4 quadrangle (scale 1:63,360), southern AK (Wolfe and Wahrhaftig, 1970).
"Type area": outcrops for a mile or 2 along Cantwell River, about 10 or 15 mi above lower forks, Sushitna basin, southern AK. Area of outcrop may be 50, 100 or more sq mi (Eldridge, 1900).
Reference section: walls of Nenana Canyon between Clear Creek and Carlo [GNC records citing Wahrhaftig, 1958, fig. 1, loc. 2].
AAPG geologic province:
Alaska Southern 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 ([ ]).