Usage:
[?] Lava Falls Tongue of Muav Limestone of Tonto Group (AZ-local)
[?] Lava Falls Tongue of Bright Angel Shale of Tonto Group (AZ-local)
Recognized locally in Grand Canyon.
Geologic age:
Middle Cambrian
Type section, locality, area and/or origin of name:
About 1 mi east of Lava Falls at foot of Toroweap Canyon, Grand Canyon, Coconino Co., northwestern AZ (McKee, 1945).
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 ([ ]).