Geologic Map
Geologic Map
Refer to Guide to the Geology of Mt. Diablo State Park
Legend
 |
Quarternary - surficial deposits |
 |
Jurassic/Cretaceous - dark greenish-gray shale sandstone interbeds (Knoxville Formation) |
 |
Thrust Fault |
 |
Quarternary - landslide deposits |
 |
Jurassic/Cretaceous - melange (Franciscian Complex) |
 |
Thrust Fault - inferred |
 |
Miocene/Pliocene - non-marine sandstone, siltstone, and conglomerate |
 |
Jurassic - chert and basalt with some
graywacke and shale (Franciscan Complex) |
 |
Faultt |
 |
Miocene - marine fossiliferous sandstone and shale |
 |
Jurassic - basalt and diabase (Coast Range Ophiolite) |
 |
Fault - Inferred |
 |
Miocene - silicic intrusive rocks |
 |
Jurassic - serpentinite (Coast Range
Ophiolite) |
 |
Roads |
 |
Eocene - massive pebbly sandstone with shale |
 |
Silica carbonate rock (altered
serpentinite) |
 |
Streams |
 |
Cretaceous - shale, siltstone, and sandstone (Great Valley Sequence) |
| Data Source Preliminary Geologic Map Emphazing
Bedrock Formations in Contra Costa County, California. Compiled by R.W. Graymer, D.L.
Jones, and E.E. Brabb U.S. Geological Survey Open-File Report 94-622 Arc/Info Data Files Simplified with minor modifications by Roi Peers and Craig Lyon, September 1996. Geologic Information Systems Map by Eric R. Sheehan, Martinez, California. |
Also refer to:
Guide to the Geology of Mount Diablo State Park for more information on the geology and geologic history.
[Return to Geology of Mt. Diablo Table of Contents]
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