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| Capistrano Formation | |
|---|---|
| Name | Capistrano Formation |
| Type | Geological formation |
| Period | Miocene–Pliocene |
| Region | Southern California |
| Country | United States |
Capistrano Formation The Capistrano Formation is a Neogene stratigraphic unit exposed in Orange County, California, Los Angeles County, California, and San Diego County, California that preserves marine and marginal marine deposits rich in fossils and tectonic information. It has been studied in the context of regional tectonics involving the San Andreas Fault, the Pacific Plate, and the North American Plate, and contributes to understanding of paleoceanography tied to the Pacific Ocean, California Current, and pseudo-oceanographic shifts during the Miocene and Pliocene. Researchers from institutions such as the University of California, Los Angeles, University of Southern California, California Institute of Technology, and the Scripps Institution of Oceanography have contributed to its interpretation.
The stratigraphic framework of the formation was built from field mapping by geologists affiliated with the United States Geological Survey and regional agencies, integrating data from measured sections near Dana Point, California, San Clemente Island, and coastal exposures adjacent to Newport Beach, California. Correlations link the unit to the overlying Pico Formation and underlying Monterey Formation facies and to basin-scale sequences recognized in the Los Angeles Basin, Santa Ana Basin, and the Peninsular Ranges. Structural relationships record deformation related to the Elsinore Fault Zone, Whittier Fault, and Cenozoic shortening associated with the Transverse Ranges uplift. Sequence stratigraphy ties transgressive-regressive cycles to global sea-level curves developed by researchers at Lamont–Doherty Earth Observatory and paleoceanographers at the Scripps Institution of Oceanography.
Lithologically the formation comprises interbedded sandstones, siltstones, and mudstones with carbonate-rich horizons and shell beds, described from logs and cores collected by the United States Bureau of Reclamation and local water districts. Sedimentological analyses employ frameworks from studies at the Sedimentary Geology Laboratory, UC Santa Barbara and sediment provenance work referencing the Sierra Nevada and Peninsular Ranges sources. Interpreted depositional environments range from inner shelf and estuarine settings to submarine fan and slope facies, informed by comparisons with modern analogs off the California coast and by hydrodynamic models used at the National Oceanic and Atmospheric Administration. Trace fossils and ichnofacies assessments reference concepts advanced by researchers associated with the Paleontological Research Institution.
Fossil assemblages include diverse mollusks, echinoderms, and vertebrate remains such as marine mammals and shark teeth, documented in collections at the Natural History Museum of Los Angeles County, San Diego Natural History Museum, and university repositories. Marine mammal finds have been compared with taxa described by paleontologists at the Smithsonian Institution and the American Museum of Natural History, and have implications for biogeographic links to faunas in the Monterey Formation and Puriscene assemblages. Benthic foraminifera and planktonic microfossils used for paleoenvironmental reconstructions were analyzed using techniques developed at the Woods Hole Oceanographic Institution and the Plymouth University micropaleontology groups. Important fossil taxa have been discussed in literature alongside works from the Carnegie Institution for Science and the California Academy of Sciences.
Biostratigraphic and isotopic dating place much of the formation in the late Miocene to early Pliocene, with magnetostratigraphic control tied to polarity chrons recognized by teams at the Paleomagnetic Laboratory and radiometric ages calibrated against the Geologic Time Scale used by the International Commission on Stratigraphy. Studies integrating strontium isotope stratigraphy reference methodologies developed at the Geological Survey of Canada and isotope laboratories at the University of California, Santa Cruz. Correlations to global events such as the Messinian Salinity Crisis and regional cooling linked to the development of the California Current are considered in chronostratigraphic syntheses by researchers at the Max Planck Institute for Chemistry and the Scripps Institution of Oceanography.
Exposures of the formation map across coastal cliffs, roadcuts, and offshore outcrops tied to mapping efforts by the California Geological Survey and county geological units for Orange County and San Diego County. Lateral facies changes correlate with contemporaneous deposits in the Santa Barbara Basin, Los Angeles Basin, and the Baja California Peninsula sequences studied by Mexican institutions such as the Universidad Nacional Autónoma de México. Correlative frameworks have been developed with assistance from basin analyses by the American Association of Petroleum Geologists and comparative stratigraphy from the Institute of Geology, UNAM.
The formation influences coastal geomorphology at locations like Crystal Cove State Park and contributes to regional groundwater aquifers managed by local water authorities and the Orange County Water District. Its sand and gravel units have been evaluated for aggregate potential in studies by the California Department of Conservation, while paleontological sites are protected under state and federal statutes administered by the California Department of Parks and Recreation and the National Park Service. Understanding its stratigraphy informs seismic hazard assessments conducted by the United States Geological Survey and urban planning by municipal governments such as Irvine, California and Newport Beach, California.
The unit was named and described in regional geological surveys and academic theses produced at institutions like the University of California, Berkeley and the California Institute of Technology. Key contributions include early mapping by geologists associated with the United States Geological Survey and subsequent paleontological descriptions published by researchers from the University of California, Los Angeles and San Diego State University. Ongoing work continues through collaborations involving the California State University, Long Beach, Scripps Institution of Oceanography, and international partners, ensuring the unit remains central to debates over Neogene tectonics and paleoenvironmental change.
Category:Geologic formations of California