Usage:
Surprise Canyon Formation (AZ*)
Geologic age:
Late Mississippian (Chesterian)*
Type section, locality, area and/or origin of name:
Type section: tributary canyon of Colorado River about 3 mi southeast of Bat Tower Overlook (Long. 113 deg. 48 min. N., Lat. 36 deg. W.) and 18 km west of Surprise Canyon, from which unit is named, Mohave Co., AZ (Billingsley and Beus, 1985).
AAPG geologic province:
Plateau sedimentary province*
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 ([ ]).