Type Geologic formation Country United States Named for Mission Valley Underlies Pomerado Conglomerate | Thickness 0–60 metres (0–197 ft) Primary Sandstone Overlies Stadium Conglomerate | |
Region San Diego County, California | ||
The Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County in Southern California.
Contents
Geology
The formation's sandstone characteristics are: soft and friable, light olive gray, fine to medium grained, and composed mostly of quartz and potassium feldspar. The Mission Valley Formation thins from the west to the east, with a maximum thickness of 0–60 metres (0–197 ft).
It overlies the Stadium Conglomerate formation, and underlies the Pomerado Conglomerate formation.
Fossils
It preserves fossils dating back to the Paleogene period of the Cenozoic Era. The formation's rocks can contain a molluscan fauna in the western and central exposures and a land-mammal fauna in the eastern exposures.
References
Mission Valley Formation Wikipedia(Text) CC BY-SA