The Tejon Formation is a

Paleogene The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...

period

geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

Geology

The formation regionally overlies the Martinez Formation or the Chico Formation. Google Books: "The stratigraphic and faunal relations of the Martinez formation to the Chico and Tejon of Southern California"
Clarence A. Waring; Stanford University Dept. of Geology; Jun 4, 2011 . accessed 1.16.2016. Paleontology in the Tejon Formation indicates a more tropical climate than during the Martinez Formation's period, with fauna that flourished in its

littoral The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely inundated), to coastal areas ...

conditions.

Occurrences

It is predominantly found in the Fort Tejon area of the San Emigdio Mountains and Tehachapi Mountains in Kern County, and around Martinez in

Contra Costa County ) of the San Francisco Bay , subdivision_type = Country , subdivision_name = United States , subdivision_type1 = State , subdivision_name1 = California , subdivision_type2 ...

. Areas it surfaces, south to north, include: *

Santa Ana Mountains The Santa Ana Mountains are a short peninsular mountain range along the coast of Southern California in the United States. They extend for approximately southeast of the Los Angeles Basin largely along the border between Orange and Riverside co ...

* Santa Monica Mountains — near Calabasas. * Simi Hills — eastern section *

Santa Susana Mountains The Santa Susana Mountains are a transverse range of mountains in Southern California, north of the city of Los Angeles, in the United States. The range runs east-west, separating the San Fernando and Simi valleys on its south from the Santa Cla ...

— section in northwestern Simi Valley * Santa Clara River Valley —

Rancho Camulos Rancho Camulos, now known as Rancho Camulos Museum, is a ranch located in the Santa Clara River Valley east of Piru, California and just north of the Santa Clara River, in Ventura County, California. It was the home of Ygnacio del Valle, a Calif ...

area *

Topatopa Mountains The Topatopa Mountains are a mountain range in Ventura County, California, north of Ojai, Santa Paula, and Fillmore. They are part of the Transverse Ranges of Southern California. Etymology A name for the mountains was first inscribed within the ...

— Sespe gorge area * Fort Tejon area of the San Emigdio Mountains and Tehachapi Mountains *

San Joaquin Valley The San Joaquin Valley ( ; es, Valle de San Joaquín) is the area of the Central Valley of the U.S. state of California that lies south of the Sacramento–San Joaquin River Delta and is drained by the San Joaquin River. It comprises seven c ...

−

Diablo Range The Diablo Range is a mountain range in the California Coast Ranges subdivision of the Pacific Coast Ranges in northern California, United States. It stretches from the eastern San Francisco Bay area at its northern end to the Salinas Valley are ...

—

New Idria Mercury Mine The New Idria Mercury Mine encompasses 8,000 acres of land in the Diablo Mountain range, incorporating the town of Idria in San Benito County, California. Idria, initially named New Idria, is situated at and 2440 feet (680m) above mean sea leve ...

area *

Mount Diablo Mount Diablo is a mountain of the Diablo Range, in Contra Costa County, California, Contra Costa County of the eastern San Francisco Bay Area in Northern California. It is south of Clayton, California, Clayton and northeast of Danville, Califo ...

— northern area * Martinez area on the

Sacramento Delta ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento C ...

* Clear Lake — Lower Lake area

Fossils

It preserves

prehistoric plant Paleobotany, which is also spelled as palaeobotany, is the branch of botany dealing with the recovery and identification of plant remains from geological contexts, and their use for the biological reconstruction of past environments (paleogeog ...

and fauna

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

s dating back to the Paleogene period of the Cenozoic Era.

Species

Species (1897 taxa names) found only in the Tejon Formation include: *

Cardita ''Cardita'' is a genus of marine bivalve molluscs in the family Carditidae. Naming Especially in the early 19th century, this genus was often confused with the Carditid genus ''Cardites''. ''Cardita'' was originally established by J.G. B ...

horni *

Fusus ''Fusus'' is a genus of small to large sea snails, marine gastropod molluscs in the family Fasciolariidae, the spindle snails and tulip snails. ''Fusus'' as a name for a genus of gastropods has confusingly been used three times. These name ...

sequileteralis *

Megistostigma ''Megistostigma'' is a genus of plant of the family Euphorbiaceae first described as a genus in 1887. It is native to southern China, Assam, and Southeast Asia. ;Species # '' Megistostigma burmanicum'' - Assam, Myanmar, Thailand, Perlis # ''Me ...

striata * Modiola ornata * Morio tuberculatus *

Telina Telina is an island in Marovo Lagoon, New Georgia Islands in Western Province, in the independent nation of Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to ...

martinezensis * Telina horni * Thracia karquinezensis * Turritella conica * Turritella infragranulata * Tritonium eocenicum

References

Paleogene California Geology of Kern County, California Geology of Los Angeles County, California Geology of Orange County, California Geology of San Benito County, California Geology of Ventura County, California Geography of the San Joaquin Valley Natural history of the Santa Monica Mountains San Emigdio Mountains Simi Hills Tehachapi Mountains Geologic formations of California {{Paleogene-stub

Geology

Occurrences

Fossils

Species

See also

References