- Usage in publication:
-
- Brokeoff andesite
- Modifications:
-
- Mapped
- AAPG geologic province:
-
- Southern Oregon basin
Summary:
Map on p. 71. Mapped (but did not describe), in Lassen region, the following units (downward order): augite andesite, Divide Peak andesite, hypersthene basalt, Brokeoff andesite, Brokeoff andesite (solfatarized), Brokeoff vents, pre-Lassen dacites, Loomis Peak dacites, Northeast Lassen dacites, Old Lassen mud flow, dacite tuff, domes, dacite breccias, Lassen 1915 dacite, and Lassen 1914-15 mud flows. Age is unknown.
Brokeoff Mountain is in Lassen Volcanic National Park, northwestern CA.
Source: US geologic names lexicon (USGS Bull. 1200, Divide Peak entry p. 614).
- Usage in publication:
-
- Brokeoff andesite
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Southern Oregon basin
Summary:
Pg. 674. [Age is] Cenozoic.
Source: US geologic names lexicon (USGS Bull. 1200, p. 488-489).
- Usage in publication:
-
- Brokeoff andesite
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Southern Oregon basin
Summary:
Pg. 77 (table 2), 78 (table 3), 79, 80 (table 4). Listed on tables and mentioned in text in report on uranium geochemistry of Lassen volcanic rocks.
Source: US geologic names lexicon (USGS Bull. 1200, p. 488-489).
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 ([ ]).