Pendleton Pit, Umatilla Co., Oregon, USA
| Latitude & Longitude (WGS84): | 45° 40' 39'' North , 118° 49' 41'' West |
|---|---|
| Latitude & Longitude (decimal): | 45.6775, -118.828055556 |
DOGAMI MLR 30-0011
Commodities (Major) - Stone - Crushed/Broken
Development Status: Past Producer
Mineral List
Regional Geology
This information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This data will improve over time as more accurate maps and data sets are added.
| Pliocene - Miocene2.588 - 23.03 Ma | Miocene-Pliocene volcanic rocks Volcanic rocks May include hypabyssal intrusions. |
| Miocene5.333 - 23.03 Ma | Miocene volcanic: mafic rocks Volcanic: mafic rocks |
| Miocene5.333 - 23.03 Ma | Wanapum Basalt Formation, Sand Hollow Unit |
| Middle Miocene11.62 - 15.97 Ma | Wanapum Basalt (middle Miocene) Major:: {basalt} Flows of gray to dark-gray, medium-grained, commonly plagioclase porphyritic basalt of Frenchman Springs petrochemical type (Wright and others, 1973). Generally exhibits blocky to platy jointing. Potassium-argon ages mostly about 15 Ma (Lux, 1982; Fiebelkorn and others, 1983) In La Grande 30' x 60' quadrangle (OR291), unit includes only the Frenchman Springs Member. In the Umatilla River Basin (OR292), includes the basalt of Powatka, Frenchman Springs Member, Sentinel Gap unit, Sand Hollow unit, and basalt of Lookingglass. |
References for regional geology:
Data provided by Macrostrat.org
Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .
USGS compilers. State geologic map data. State Maps.
Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.
R.L. Smith, W.P. Roe (compilers). Oregon Geologic Data Compilation, release 6. State of Oregon Department of Geology and Mineral Industries.
