Age of First Marine Terrace Near Santa Cruz, California

Bradley, William C.; Addicott, Warren O.

doi:10.1130/0016-7606(1968)79[1203:aofmtn]2.0.co;2

Cited by 32 publications

(24 citation statements)

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“…Anderson and Menking (1994) reviewed many of the previous age estimates made for this terrace. Bradley and Addicott (1968) reported U-series ages of mollusks of 60,000-100,000 yr BP, but Bradley and Griggs (1976) pointed out that U-series ages of mollusks are unreliable. The latter workers suggested instead that the Highway 1 platform, present just above the Davenport platform, was cut during the 120,000-yr-BP high stand of sea.…”

Section: Uranium-series Ages Of Terrace Coralsmentioning

confidence: 99%

A cool eastern Pacific Ocean at the close of the Last Interglacial complex

Muhs

Simmons

Kennedy³

et al. 2006

Quaternary Science Reviews

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New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals (Balanophyllia elegans) from several marine terrace localities along the California and southern Oregon coasts date to the 80,000 yr BP high stand of sea, correlative with marine isotope substage 5a, late in the last interglacial complex. Ages of multiple corals from localities north of Point An˜o Nuevo (central California) and San Nicolas Island (southern California) suggest that this high sea stand could have lasted at least 8000 yr, from 84,000 to 76,000 yr BP. These ages overlap with those from marine deposits on tectonically stable Bermuda and tectonically emergent Barbados. Higher-elevation terraces at two California localities, in the Palos Verdes Hills and on San Nicolas Island, have corals with ages that range mostly from 121,000 to 116,000 yr BP, correlative with marine isotope substage 5e. These ages are similar to those reported for other terraces in southern California but are younger than some ages reported from Hawaii, Barbados and the Bahamas.Marine terrace faunas are excellent proxies for nearshore marine paleotemperatures during past high sea stands. Terraces on the Palos Verdes Hills and San Nicolas Island dated to the 120,000 yr BP high sea stand have dominantly zoogeographically ''neutral'' species in exposed coastal localities, indicating nearshore waters similar to those of today. In contrast, 80,000 yr BP, exposed coastal localities typically have molluscan faunas characterized by numerous extralimital northern species and a lack of extralimital southern species. These fossil assemblages are indicative of nearshore water temperatures that were cooler than modern temperatures at 80,000 yr BP. Waters at least as warm as today's at 120,000 yr BP and cooler than present at 80,000 yr BP are in excellent agreement with marine alkenone records and coastal vegetation records derived from pollen data, from both southern and northern California. Decreased insolation or increased upwelling seem inadequate to explain the cool waters off the Pacific Coast from southern Oregon to southern California at 80,000 yr BP. We propose that a stronger California Current (or at least one with a greater component of subarctic waters) may explain cooler-than-modern coastal waters during the 80,000 yr BP high sea stand. r

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Section: Uranium-series Ages Of Terrace Coralsmentioning

confidence: 99%

A cool eastern Pacific Ocean at the close of the Last Interglacial complex

Muhs

Simmons

Kennedy³

et al. 2006

Quaternary Science Reviews

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“…We know that the Reliz fault ( fig. 4) has had some movement during the time the terraces were forming (Rosenberg and Clark, 2009;Finnegan and Balco, 2013), and we know that during that same time period, the sea level has fluctuated as a result of global climate (Alexander, 1953;Bradley and Addicott, 1968;Imbrie and others, 1984), resulting in periods of rapid incision downstream of the Reliz fault (Bull, 1990). Both tectonics and climate change have directly influenced the formation of strath terraces in Arroyo Seco.…”

Section: Landscape Evolution Resulting From Changes In Global Climatementioning

confidence: 99%

Investigating the landscape of Arroyo Seco—Decoding the past—A teaching guide to climate-controlled landscape evolution in a tectonically active region

Taylor¹,

Sweetkind²,

Havens³

2017

Circular

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“…Prominent elevated beach terraces indicate that Pleistocene uplift occurred along the coast in nearby areas (Bradley, 1957(Bradley, , 1958(Bradley, , 1965Jack, 1968;Smith, 1960;Palmer, 1967;Bradley andAddicott, 1968), andLaJoie, Weber, andTinsley (1972) demonstrated that, in the area described in this report, the terraces have been tilted as well as uplifted. The observations reported here indicate that, at least in the vicinity of Pescadero, this tilting is still active.…”

Section: Geomorphic Evidence For Late Holocene Tilting In Southern Samentioning

confidence: 99%

Journal of Research of the U. S. Geological Survey, 1975, volume 3, issue 5

1975

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Age of First Marine Terrace Near Santa Cruz, California

Cited by 32 publications

References 0 publications

A cool eastern Pacific Ocean at the close of the Last Interglacial complex

A cool eastern Pacific Ocean at the close of the Last Interglacial complex

Investigating the landscape of Arroyo Seco—Decoding the past—A teaching guide to climate-controlled landscape evolution in a tectonically active region

Journal of Research of the U. S. Geological Survey, 1975, volume 3, issue 5

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