Usage:
Eldorado Orthogneiss (WA*)
Eldorado Gneiss (WA)
Geologic age:
Late Cretaceous* [intrusive age]
Late Cretaceous to early Tertiary* [metamorphic age]
Type section, locality, area and/or origin of name:
Principal reference area: Eldorado, Klawatti, and Primus Peaks, and connecting ridges; from sec. 8, T. 35 N., R. 12 E., to sec. 27, T. 36 N., R. 13 E., Mount Baker 30- x 60-min quadrangle, northern WA (Haugerud and others, 1991).
AAPG geologic province:
Cascades 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 ([ ]).