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Obispo Formation

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Series: SEPM Field Trip Guide
Published: 01 January 1984
DOI: 10.2110/pec.55.04.0032
EISBN: 9781565762770
... Abstract The pyroclastic Miocene Obispo Formation (15-17 m.y.b.p.) was deposited in a continental submarine margin along the “leaky” San Luis Obispo transform (SLOT). These bimodal volcanic rocks (rhyolitic pyroclastics and basaltic flows and sills) occur along a linear trend that extends...
Journal Article
Journal: GSA Bulletin
Published: 01 April 1966
GSA Bulletin (1966) 77 (4): 443-446.
...CLARENCE A HALL; DONALD L TURNER; RONALD C SURDAM Abstract Fossil pelecypods, Pecten (Amusium) lompocensis Arnold and Pecten (Lyropecten) crassicardo Conrad, were discovered in rhyohtic tuff and breccia of the Obispo Formation, San Luis Obispo County, California. The potassium-argon age...
Journal Article
Journal: GSA Bulletin
Published: 01 April 1974
GSA Bulletin (1974) 85 (4): 523-532.
...W. G. ERNST; C. A. HALL, JR. Abstract Geologic mapping in the Cambria and Black Mountain areas, western San Luis Obispo County, California, has led to recognition of the two stratigraphically and petrologically distinct extrusive felsic igneous units: (1) the Obispo Formation; and (2) a new unit...
Book Chapter

Author(s)
Ronald C. Surdam
... of the area (Hall and Corbato, 1967; Hall, 1973a, and 1973b). Surdam, Stanley and Kablanow have spent considerable time in the Pismo and Huasna basins studying the Obispo, Monterey, Pismo and Santa Margarita formations. In addition, Stanley has spent two field seasons mapping and evaluating stratigraphic...
Journal Article
Journal: Geology
Published: 01 July 1986
Geology (1986) 14 (7): 571-573.
... Obispo Tuff at Shell Beach, central California, and also in a tuff layer (Deep Creek Tuff) in the Miocene John Day Formation of eastern Oregon. The etchings occur in three different patterns with two subtypes, depending on the formation in which they occur. Type A is an anastomosing pattern...
Journal Article
Journal: GSA Bulletin
Published: 01 May 1967
GSA Bulletin (1967) 78 (5): 559-582.
... in most places and display changes in facies from clastic sedimentary rocks to basaltic and andesitic lavas or to tuffs of the Obispo Formation. Middle and upper Miocene rocks of the Monterey (Luisian to upper Mohnian) and Santa Margarita (upper Mohnian to upper Delmontian or “Repettian”?) Formations...
Series: SEPM Field Trip Guide
Published: 01 January 1984
DOI: 10.2110/pec.55.04.0195
EISBN: 9781565762770
... Luis Obispo County, California. This basin was studied because of its excellent hydrocarbon potential due to organic rich sediments. The Miocene Monterey Formation contains as much as 5 weight percent organic carbon and is as much as 1500 meters thick in the Pismo Basin. A thermally subsiding basin...
Series: GSA Special Papers
Published: 01 December 2015
DOI: 10.1130/2015.2513(07)
... volcanic rocks have mid-ocean-ridge basalt–like chemistry. The field and geochemical data indicate formation in a suprasubduction-zone setting above an east-dipping proto-Franciscan subduction zone due to the onset of subduction and subsequent slab rollback. Multiple stages of magmatism ensued, until...
Journal Article
Journal: GSA Bulletin
Published: 01 April 1972
GSA Bulletin (1972) 83 (4): 957-972.
...BENJAMIN M PAGE Abstract A remnant of Mesozoic oceanic crust and mantle overlain by marine sediments occurs northwest of San Luis Obispo, California. The remnant is composed of four principal units. The first (lowermost) unit is serpentinite derived in part from harzburgite, and is more than 1 km...
Journal Article
Published: 01 September 1966
Journal of Paleontology (1966) 40 (5): 1123-1126.
...Clarence A. Hall Abstract A new spatangoid echinoid, Archaeopneustes moorefieldi n. sp., is described from moderately deep (150 to 300 feet) or deep water-deposited Pliocene sediments [Pismo Formation] exposed in Castro Canyon, western San Luis Obispo County, Calif. Mr. J. R. Moorefield discovered...
Journal Article
Published: 01 August 1966
Bulletin of the Seismological Society of America (1966) 56 (4): 961-971.
... Luis Obispo County. A P -wave first-motion fault plane solution shows strike of vertical fault plane is N 33°W, coinciding with a surface zone of en echelon fault fractures in the pattern characteristic of right-lateral, strike-slip movement. The motion appears to have an upward component on the west...
Journal Article
Published: 04 September 2018
Bulletin of the Seismological Society of America (2018) 108 (6): 3225-3247.
... in the 3D survey area include tuffaceous sandstone and siltstone of the Miocene Obispo Formation. Stratified Miocene Monterey Formation and Pliocene Pismo Formation are locally present on the inner shelf in San Luis Obispo Bay ( PG&E, 2011 ) but are not present in the 3D survey area. We map...
FIGURES | View All (12)
Journal Article
Published: 01 July 2001
Journal of Paleontology (2001) 75 (4): 860-869.
...M. S. DE LA FUENTE; M. ITURRALDE-VINENT Abstract The oldest Jurassic marine pleurodire is reported from the Jagua Formation in western Cuba. These remains are from levels of middle and late Oxfordian age. This turtle represents a new genus and species, Caribemys oxfordiensis. A phylogenetic...
FIGURES | View All (7)
Journal Article
Journal: Geosphere
Published: 20 December 2018
Geosphere (2018) 15 (1): 171-187.
... of Franciscan Complex mélange and broken formation tectonically overlain by remnants of Jurassic ophiolite and forearc basin sedimentary rocks, and is correlative with the Franciscan Complex–Great Valley Group pair exposed along the western margin of the San Joaquin Valley ( Gilbert and Dickinson, 1970...
FIGURES | View All (8)
Journal Article
Published: 22 August 2018
Canadian Journal of Earth Sciences (2018) 56 (1): 32-46.
... can further affect sediment delivery and preservation, e.g., via effects on water column turbulence. Diverse environmental factors contribute to varve formation, so varved sediments can occur in numerous settings, including marine and lacustrine locales. Varves often form in “proglacial” lakes...
FIGURES | View All (12)
Journal Article
Journal: Geosphere
Published: 01 August 2013
Geosphere (2013) 9 (4): 853-863.
... and subsequently juxtaposed in a complex series of collisional events, which include events related to arc formation and amalgamation, i.e., the Elzevirian (ca. 1245–1225 Ma) and Shawinigan (ca. 1190–1140 Ma) orogenies, and two Grenvillian events related to later continental collisional orogenic phases...
FIGURES | View All (7)
Journal Article
Published: 01 December 2005
Bulletin of the Seismological Society of America (2005) 95 (6): 2396-2411.
... as active ( Hardebeck et al. , 2004 ). It caused damage to buildings and lifelines in San Luis Obispo County. Although most of the damage was near the fault that produced the earthquake, significant damage occurred at Oceano, California, which was approximately 63 km from the southeastern end...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 1973
GSA Bulletin (1973) 84 (1): 369-370.
Series: Guidebook
Publisher: The Pacific Section American Association of Petroleum Geologists
Published: 01 January 2001
DOI: 10.32375/2001-GB75.7
EISBN: 9781732014855
... Formation at Midway-Sunset Oil Field (a major mechanism causing these turbidity flows was probably movement along the San Andreas fault, in other words, the flows were seismically induced). The fans were generally timetransgressive northwestward, as the Gabilan Range was transported right laterally...
Series: Guidebook
Publisher: The Pacific Section American Association of Petroleum Geologists
Published: 01 January 1994
DOI: 10.32375/1994-GB72.4
EISBN: 9781732014831
... ABSTRACT The major and trace element composition of seventy whole-rock samples of volcanic ash, tuff, and bentonite from beach outcrops of the Monterey Formation west of Santa Barbara were analyzed to determine if these tephra layers could be used as a stratigraphic correlation tool. Five broad...