| 词条 | Moraga Formation |
| 释义 |
| name = Moraga Formation (Moraga Volcanics) | image =Sibley Volcanic Regional Preserve - Stierch A.jpg | caption = Moraga Volcanics in Robert Sibley Volcanic Regional Preserve, Berkeley Hills | type = Geologic formation | age = Pliocene epoch | period = Pliocene | prilithology = Basaltic lava, with andesite, basalt, rhyolite tuff | otherlithology =Clay, conglomerate, limestone | namedfor = Moraga Valley | namedby = | region = Berkeley Hills, Alameda County and Contra Costa County, California | country = United States | coordinates = | unitof = | subunits = | underlies = Siesta Formation of Great Valley Group | overlies = Orinda Formation | thickness = {{convert|1200 |ft|m}} | extent = | area = | map = | map_caption = }} The Moraga Formation or Moraga Volcanics is a Pliocene epoch volcanic geologic formation in the Berkeley Hills of the East Bay region of the San Francisco Bay Area, California. [1] The basaltic lava flow formation is found within Alameda County and Contra Costa County. [2][1] It can be seen in the Robert Sibley Volcanic Regional Preserve and Caldecott Tunnel area of the Berkeley Hills. [3] It is named for an exposed occurrence in the Moraga Valley. It overlies the Orinda Formation, and underlies the Siesta Formation of Great Valley Group. [4]
It preserves freshwater fossils dating back to the Pliocene epoch of the Neogene period. [5] See also{{Portal|California|Neogene|Paleontology}}
References1. ^1 [https://pubs.usgs.gov/bul/1251j/report.pdf USGS.gov: "Upper Cretaceous and Lower Tertiary Rocks Berkeley and San Leandro Hills, California"], by J. E. Case, GEOLOGICAL SURVEY BULLETIN 1251-J, 1968. 2. ^[https://oaklandgeology.wordpress.com/2011/07/25/grizzly-peak-and-moraga-basalt/ Oakland Geology Blog: "Grizzly Peak and Moraga basalt"] 3. ^Geology.about.com: "California Transect - Stop 30, Orinda Formation and Moraga Volcanics" 4. ^Lawrence Berkeley Lab.gov: "Berkeley Lab Geologist Studies the Ground Beneath His Feet" 5. ^{{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= }} External links
Robert Sibley Volcanic Regional Preserve}}{{-}}{{California-geologic-formation-stub}}{{Neogene-stub}} 10 : Berkeley Hills|Pliocene California|Geologic formations of California|Geology of Alameda County, California|Geology of Contra Costa County, California|Natural history of the California Coast Ranges|Natural history of the San Francisco Bay Area|Volcanism of California|Pliocene Series of North America|Pliocene volcanism |
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