Oak Grove Fork, Clackamas River localities, Clackamas Co., Oregon, USA
|Latitude & Longitude (WGS84):||45° 4' 28'' North , 122° 3' 3'' West|
|Latitude & Longitude (decimal):||45.07472,-122.05111|
|Köppen climate type:||Csb : Warm-summer Mediterranean climate|
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6 valid minerals.
This geological map and associated 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 does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Holocene - Pleistocene|
0 - 2.588 Ma
|Landslide and debris-flow deposits|
Age: Pleistocene (0 - 2.588 Ma)
Description: Unstratified mixtures of fragments of adjacent bedrock. Locally includes slope wash and colluvium. Largest slides and debris flows occur where thick sections of basalt and andesite flows overlie clayey tuffaceous rocks. May include some deposits of late Pliocene age
Comments: In OR291, includes active or recently active slides marked by tilted trees and bent tree trunks. Includes debris flow deposits along the margins of Grande Ronde Valley formed during catastrophic collapse of high-standing dacite cliffs at Mt. Emily.Landslide deposits not included in State map (OR001) in Umatilla River Basin, but included in OR292
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
0 - 2.588 Ma
|Quaternary surficial deposits; Alluvial deposits|