- Usage in publication:
-
- Lake Dorothy hornfels*
- Modifications:
-
- Named
- Dominant lithology:
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- Hornfels
- AAPG geologic province:
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- Sierra Nevada province
Summary:
Type locality designated as immediately east of Dorothy Lake, Mount Morrison 15' quad, Mono Co, CA. Discontinuously exposed from north end of ridge separating Laurel and Sherwin Creeks southeastward about 8.5 mi to Big McGee Lake about 1 mi south of quad boundary in Mount Abbot quad. Consists of dense yellowish-gray to grayish-black layered quartz-plagioclase-pyroxene hornfels; siliceous hornfels locally present near south boundary of quad. Cut by diorite intrusion south of Constance Lake. Is about 1000 ft thick north of Lake Genevieve, where it appears least disturbed structurally. Contact with underlying Mildred Lake hornfels (new) commonly gradational. Underlies Bloody Mountain (new). Shown on geologic map as part of Bloody Mountain block. Age is Pennsylvanian and/or Permian(?) based on fossils collected from upper part of unit and identified by Mackenzie Gordon, Jr. [note (?) in age here is redundant]
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).