Usage:
Rattlesnake Formation (OR*)
Subunits:
informal Rattlesnake ash-flow tuff (OR).
Geologic age:
late Tertiary (late Miocene; Hemphillian NALMA)*
Type section, locality, area and/or origin of name:
Type locality: on Rattlesnake Creek, about 1 mi west of Cottonwood, John Day country, central northern OR (Merriam, 1901).
Type locality stated to be in NW/4 SE/4 NE/4 SW/4 sec. 19, T. 11 S., R. 26 E.; [approx. Lat. 44 deg. 30 min. 44 sec. N., Long. 119 deg. 38 min. 41 sec. W.]; UTM Zone 11, NAD27, 289,782 m E., 4,931,979 m N.; Picture Gorge 7.5-min quadrangle, Grant Co., OR (Retallack and others, 2002, Palaeogeog., Palaeoclim., Palaeoecol., v. 183, p. 329-354; Prothero and others, 2006, Paleobios, v. 26, no. 1, p. 21-26).
AAPG geologic province:
Snake River basin*
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 ([ ]).