Graduate Thesis Or Dissertation
 

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  • Subsurface mapping was used to determine the structure andgeologic history of the South Cuyama dome and part of the Russellfault in the South Cuyama oil field area. Deformed Late Cretaceousand or early Tertiary marine strata are unconformably overlain bythe late Oligocene to early Miocene Vaqueros Formation (QuailCanyon Sandstone Member, Soda Lake Shale Member, and Painted RockSandstone Member) northeast of the Russell fault. Rapid subsidenceabruptly downdropped shelf deposits in the transgressive QuailCanyon Sandstone, ending shallow-marine deposition. Warping of theQuail Canyon shelf formed elongate west-northwest-trending submarinetroughs and highs at the same time as the basinal Soda Lake ShaleMember was deposited. Locally, the Soda Lake Shale ponded in topographiclows floored by Quail Canyon Sandstone. In addition, progradingturbidites of the Soda Lake Shale Member and shelf depositsof the Painted Rock Sandstone thinned over the highs, including theproto-South Cuyama dome. Renewed subsidence during the late Saucesianaccompanied deposition of the Saltos Shale Member of the MontereyFormation. Late Saucesian-early Relizian movement along thenortheast-trending Cox normal fault set in part controlled furthergrowth of the proto-South Cuyama dome and thinning of the SaltosShale over structural highs. Shelf and shallow-marine depositsof the Branch Canyon Sandstone and overlying undifferentiatedBranch Canyon Sandstone-Santa Margarita Formation (BCSM) progradedacross the basin during the middle and late Miocene. Major rightslipalong the Russell fault juxtaposed contrasting coeval stratigraphicsections prior to deposition of the Pliocene(?) Morales(?)Formation. Northeast-trending normal faults and northwest-trendingstrike-slip faults formed across the dome during deposition of theBCSM in response to right-lateral wrench faulting on the Russellfault. The Morales(?) Formation conformably overlies the BCSM andprobably represents the transition from marine to nonmarine deposition;the uppermost part possibly includes Pleistocene alluvialdeposits. Right slip along the Russell fault was accompanied byfolding of at least the lowermost Morales(?) into the present-daySouth Cuyama elongate dome subparallel to the Russell fault.Right-stepping en echelon axial culminations on the dome were offset4,500 feet right-laterally by the Russell fault.The south-dipping South Cuyama thrust fault tectonically overrodethe Russell fault, South Cuyama dome, and Pleistocene alluvialdeposits, folding and thrusting Eocene and younger strata of theSierra Madre Mountains northward. The north-dipping Morales faultthrust Paleocene to Miocene strata of the Caliente Range southwardover Pliocene(?)-Pleistocene alluvial deposits during the latePleistocene. Between these two thrust faults is the present-dayCuyama Valley.Structures in the South Cuyama oil field and adjacent areasformed in response to recurrent right-lateral wrench tectonismalong the Russell fault during the middle to late Miocene andpossibly from latest Oligocene to Pliocene time. The complexfaulting and folding associated with wrench tectonism are obscuredby the Pleistocene-Holocene contractile regime.
  • Subsurface mapping was used to determine the structure andgeologic history of the South Cuyama dome and part of the Russellfault in the South Cuyama oil field area. Deformed Late Cretaceousand or early Tertiary marine strata are unconformably overlain bythe late Oligocene to early Miocene Vaqueros Formation (QuailCanyon Sandstone Member
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