| 词条 | Mission Valley Formation |
| 释义 |
| name = Mission Valley Formation | image = | caption = | type = Geologic formation | age = Paleogene | period = Paleogene | prilithology =sandstone | otherlithology = | namedfor =Mission Valley, San Diego | namedby = | region = San Diego County, California | country = United States | coordinates = | unitof = | subunits = | underlies =Pomerado Conglomerate | overlies =Stadium Conglomerate | thickness ={{convert|0|-|60|m|ft}} | extent = | area = | map = | map_caption = }} The Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County in Southern California.[1][2] GeologyThe formation's sandstone characteristics are: soft and friable, light olive gray, fine to medium grained, and composed mostly of quartz and potassium feldspar.[1] The Mission Valley Formation thins from the west to the east, with a maximum thickness of {{convert|0|-|60|m|ft}}.[1] It overlies the Stadium Conglomerate formation, and underlies the Pomerado Conglomerate formation.[1] FossilsIt preserves fossils dating back to the Paleogene period of the Cenozoic Era.[3] The formation's rocks can contain a molluscan fauna in the western and central exposures and a land-mammal fauna in the eastern exposures.[1] See also{{Portal|Paleogene|California}}
References1. ^1 2 3 4 {{cite book |last=Kennedy |first=Michael P. |date=1975 |title=Geology of the San Diego metropolitan area, California |url=https://archive.org/details/geologyofsandieg00kennrich |publisher=California Division of Mines and Geology |page=}} 2. ^Geiconsultants.com: Geologic Formations of Western San Diego County, by Jeffrey D. Brown, R.G., C.E.G. − circa 1996. 3. ^{{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= Various Contributors to the Paleobiology Database|url= http://www.fossilworks.org/|accessdate= 8 July 2014|deadurl= yes|archiveurl= https://web.archive.org/web/20140731140924/http://fossilworks.org/|archivedate= 31 July 2014|df= }} Further reading
6 : Paleogene California|Geology of San Diego County, California|Sandstone formations of the United States|Geography of San Diego|Mission Valley, San Diego|Geologic formations of California |
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