Usage:
Marsden Tuff Member of Escalante Desert Formation of Needles Range Group (UT*)
Geologic age:
Tertiary*
Oligocene*
Type section, locality, area and/or origin of name:
Type section: in sec. 25, T. 31 S., R. 15 W., Lund 7.5-min quadrangle, Iron Co., UT. Named from Marsden Spring, Iron Co., UT (Best and Grant, 1987).
AAPG geologic province:
Great Basin 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 ([ ]).