Repetto Formation

{{Short description|Geological formation in Southern California, United States}} {{Infobox rockunit | name = Repetto Formation | image = | caption = | type = Geologic formation | age = Early Pliocene, {{fossil range|5.33|3.60}} | period = Zanclean | prilithology = | otherlithology = | namedfor = | namedby = | region = Los Angeles Basin<br>Los Angeles County, California | country = United States | coordinates = | unitof =Los Angeles Basin | subunits = | underlies =Pico Formation | overlies =Puente Formation | thickness = | extent = | area = | map = | map_caption = }} The '''Repetto Formation''' is a Pliocene epoch sedimentary unit in the greater Los Angeles Basin composed primarily of sandstone and conglomerate.

==Geology== The unit records deposition of a submarine fan environment at lower bathyal depths, and is recognized as a productive petroleum reservoir.<ref name="beg.utexas.edu">[http://www.beg.utexas.edu/environqlty/co2seq/co2data/0repetto.htm Repetto Formation, at Bureau of Economic Geology, University of Texas, Austin] {{webarchive|url=https://web.archive.org/web/20110719084714/http://www.beg.utexas.edu/environqlty/co2seq/co2data/0repetto.htm |date=2011-07-19 }}</ref><ref name="Blake1991">Blake, Gregg H. 1991. "Review of the Neogene biostratigraphy and stratigraphy of the Los Angeles Basin and implications for basin evolution," In: Biddle, Kevin T. (ed), "Active Margin Basins", AAPG Memoir 52, 319pp.</ref>

The formation underlies the Pico Formation, both of the Neogene period. It overlies the Miocene-aged Puente Formation.<ref>{{Cite web |title=Geolex — SycamoreCanyon publications |url=https://ngmdb.usgs.gov/Geolex/UnitRefs/SycamoreCanyonRefs_14616.html |access-date=2024-11-29 |website=ngmdb.usgs.gov}}</ref>

===Classification=== The Repetto Formation is equivalent in age to the Fernando Formation; some researchers consider it (as well as the overlying Pico Formation) to be a junior synonym based on benthic foraminifera stages.<ref name="Sorlien2013">{{cite journal |last1=Sorlien |first1=Christopher C. |last2=Seeber |first2=Leonardo |last3=Broderick |first3=Kris G. |last4=Luyendyk |first4=Bruce P. |last5=Fisher |first5=Michael A. |last6=Sliter |first6=Ray W. |last7=Normark |first7=William R. |title=The Palos Verdes anticlinorium along the Los Angeles, California coast: Implications for underlying thrust faulting |journal=Geochemistry, Geophysics, Geosystems |date=June 2013 |volume=14 |issue=6 |pages=1866–1890 |doi=10.1002/ggge.20112}}</ref> Other researchers maintain that the Repetto and Pico Formations are distinct stratigraphic units, and that the use of the name "Fernando Formation" should be stopped due to several issues with stratigraphic correlation and access to the type section.<ref name="Blake1991">Blake, Gregg H. 1991. "Review of the Neogene biostratigraphy and stratigraphy of the Los Angeles Basin and implications for basin evolution," In: Biddle, Kevin T. (ed), "Active Margin Basins", AAPG Memoir 52, 319pp.</ref>

==See also== *{{C|Geology of Los Angeles County, California}} *List of fossiliferous stratigraphic units in California

== References == {{reflist|30em}}

Category:Pliocene California Category:Geology of Los Angeles County, California Category:Geologic formations of California Category:Petroleum in California