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- W1484709660 abstract "The Topanga Formation within the central Santa Monica Mountains of southern California is a sequence of lower Miocene conglomerate, sandstone, and siltstone deposits that record two major cycles of marine retrogradation separated by delta progradation. The provenance for these strata is reworked lower Miocene and Oligocene formations from within the Santa Monica Mountains and more distant mafic and high-rank metamorphic source areas in the San Gabriel Mountains. Sedimentary environments represented in the Topanga Formation consist of wave-dominate d, coastal deposits and river-dominated, coastal and fluvial deltaic deposits. At the basal portion of the sequence and within the Saddle Peak Tongue east of Malibu Canyon, wave-dominated coastal environments reflect an eastward-tran sgressing coastline that was characterized by moderate- to high-energy waves. A black, fissile siltstone at the base of the sequence west of Malibu Canyon and comprising all of the Encinal Tongue of the Rincon Shale within the study area indicates restricted circulation within the offshore environment during marine transgression. An influx of coarse clastic sediment within the middle portion of the sequence signifies the onset of river-dominated, deltaic sedimentation. The progradation of separate distributary systems caused a westward regression of the shoreline. Channel avulsion and lobe abandonment, followed by subsidence and a return to wave dominance, caused shoreface and delta-front deposits to interfinger locally within the middle undifferentiated Topanga Formation through Malibu Canyon. A northwesttrending shoreline is postulated during delta progradation. Fluvial deposits comprising the Fernwood Tongue of the Sespe Formation east of Piuma Road form the upper delta plain within the prograding delta system. Both meandering and braided channel deposits were present at different times within the upper delta plain which reflects alternating conditions of stable flow and episodic or seasonal flood events. Strata east of Malibu Canyon, within the upper part of the undifferentiated Topanga Formation and Cold Creek Member, record an acceleration of basin subsidenc e and retrogradation of deeper marine environments. Although deltaic sedimentation continued, rapid basin subsidence caused an eastward transgression of marine environments and regression of the shoreline and delta-plain environments." @default.
- W1484709660 created "2016-06-24" @default.
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- W1484709660 date "1993-01-01" @default.
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- W1484709660 title "Depositional Environments of the “Topanga Canyon” Formation, the Encinal Tongue of the Rincon Shale, and the Fernwood Tongue of the Sespe Formation, Central Santa Monica Mountains, California" @default.
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