Thalassiosira praeoestrupii: A New Diatom Species for Recognizing the Miocene/Pliocene Epoch Boundary in Coastal California

Dumont, Michael P.; Baldauf, J.G.; Barron, John A.

doi:10.2307/1485728

Cited by 21 publications

(35 citation statements)

References 13 publications

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“…a result consistent with the extrapolations of Barron (1 98 1) and Rarron and Keller (1983 lack Thalassiosira oestrupii but contain T. praeoesfrupii Dumont, Baldauf and Barron (1986) and Lirhodesmium cornigerum, and are assignable to Subzone 1 within the uppermost part of the Nitzschia reinholdii Zone. Samples H-3C through H-6 contain the stratigraphic overlap of T. aestrupii and T. nativa Sheshukova-Poretzkaya and constitute a lower Further studies are required to determine whether these various subzones are useful throughout the Santa Maria Basin of California.…”

supporting

confidence: 88%

“…Underlying Samples H-2a through H-3B at Harris Grade contain Thalassiosira praeoestrupii, a diatom which first occurs at the top of Chron 5 in California according to the paleomagnetic studies of Madrid et al (in press) and Dumont et at. (1986) at Santa Cruz.…”

Section: Age Of the Harris Grade Sectionmentioning

confidence: 99%

“…Typically, these deposits contain hernipelagic diatomaceous shales of the Monterey Formation (upper lower Miocene to upper Miocene) overlain by more massive, detritus-rich diatomaceous mudstones of the Capistrano Formation, the Malaga Mudstone Member of the Monterey Formation, the Sisquoc Formation, or the Purisima Formation (uppermost Miocene to lower Pliocene) (Ingle 198 1;Barron 1986). …”

Section: Introductionmentioning

confidence: 99%

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Diatom Stratigraphy of the Lower Pliocene Part of the Sisquoc Formation, Harris Grade Section, California

Barron¹,

Baldauf²

1986

Micropaleontology

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ZOcean Drilling Program, Texas A&lM University, Callege Station, T a a s 77843-3469 ABSTRACE Lower Pliocene diatoms were studied from the Sisquoc Formation and lowermost Foxen Mudstone, exposed along Hams Grade north of Lompoc, California, to refine the diatom biostratigraphy of post-Montercy Formation sediments in California. Sixty-seven diatom taxa were identified in the 25 samples examined from the 790-m thick (2950-ft) section. The diatoms are assignable to the uppermost N~rzschia reinholdii Zone and Thalassros~ra oestrupi~ Zone of Damn (1 98 11, and five tcntative subzones for local correlation are proposed. Regional correlations and taxon occurrence are discussed, and the base of the Aritzschia reinholdii Zone is redefined as at the last occurrence of Thalassionema schraderi.

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supporting

confidence: 88%

Section: Age Of the Harris Grade Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diatom Stratigraphy of the Lower Pliocene Part of the Sisquoc Formation, Harris Grade Section, California

Barron¹,

Baldauf²

1986

Micropaleontology

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“…Within NSOD Zone 12 the Miocene/Pliocene boundary may lie within the lower part of Core 119-737A-13H based on the first occurrence of Thalassiosira praeoestrupii (5.4 Ma) in Sample 119-737A-13H-CC (a marker for the Miocene/Pliocene in California; Dumont et al, 1986) and the last occurrence of Thalassiosira miocenica in the same sample. T. miocenica is a warm to warm-temperate species that disappears at 5.35 Ma in the middlelatitude northwest Pacific (Koizumi and Tanimura, 1985), and such an age is suggested in Hole 737A for this event based on its near coincidence with the first occurrence of T. praeoestrupii.…”

Section: Sue 737mentioning

confidence: 99%

Diatom Biostratigraphy: Kerguelen Plateau and Prydz Bay Regions of the Southern Ocean.

Baldauf¹,

Barron²

1991

Proceedings of the Ocean Drilling Program

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Samples were examined for diatoms from 22 holes at 11 sites cored by ODP Leg 119 on the Kerguelen Plateau and in Prydz Bay, East Antarctica. Diatoms were observed in Oligocene through Holocene sediments recovered from the Kerguelen Plateau. The diatom flora from the Kerguelen Plateau is characterized by species such as Azpeitia oligocenica, Rocella gelida, Rocella vigilans, and Synedra jouseana in the Oligocene and Crucidenticula nicobarica, Denticulopsis hustedtii, Nitzschia miocenica, and Thalassiosira miocenica in the Miocene. This somewhat cosmopolitan assemblage gives way to a Pliocene and Holocene assemblage characterized by species such as Nitzschia kerguelensis, Thalassiosira inura, and Thalassiosira torokina, which are endemic to the Southern Ocean region. Samples examined from Prydz Bay are generally devoid of diatoms. The exception is Site 739, where diatoms occur sporadically in lower Oligocene and upper Miocene through Quaternary sediments.The Leg 119 diatom biostratigraphic results allow the development of a stratigraphic framework for the Indian sector of the Southern Ocean. This diatom zonation integrates diatom zonations developed previously for other sectors of the Southern Ocean. The zonation proposed here is based on biostratigraphic events of both geographically widespread and endemic species calibrated to the paleomagnetic stratigraphy. As such, this zonation has application throughout the Southern Ocean and allows correlation from the southern high latitudes to the low latitudes.

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“…However, in the Queenie structure, technique, described by Suppe [1985], simplifies quantitative pre-Pliocene formations thicken substantially towardwhat is now retrodeformation of the cross sections wkhout significantly the central region of the fold, more than doubling in thickness In our restoration, we assume that nonfold or nonfault related shortening (i.e., volume decrease due to layer-parallel shortening) is insignificant. Although some studies in the Appalachian Plateau have reported layer parallel shortening of 10-15% primarily through pressure solution [Nickelson, 1966;Engelder and Engelder, 1977], we believe that such a mechanism is unlikely to produce large amounts of layer-parallel volume the Miocene units generally pinch out along the southwestern edge of the Queenie structure, as shown in Figure 10c, rather than terminate abruptly against such growth normal faults. This observation suggests that the Miocene subbasin formed primarily through crustal flexure or distributed normal shearing at the basin margin.…”

Section: Kink Methods Of Fold Modelingmentioning

confidence: 73%

Structural Analysis of Late Neogene Deformation in the Central Offshore Santa Maria Basin, California

Clark¹,

Hall²,

Hamilton³

et al. 1991

J. Geophys. Res.

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Structural analysis of the Queenie structure, a topographically prominent, southwest vergent asymmetric fold located 35 km west of Point Sal, constrains the timing and nature of late Neogene deformation in a transect across the central offshore Santa Maria Basin. Analysis of post‐Miocene sediments mantling the fold indicates that the Queenie structure was formed in a relatively brief episode of NE‐SW directed shortening between 5 and 3 Ma, apparently in response to the onset of compression normal to the North American/Pacific plate boundary. Retrodeformation of depth‐corrected cross sections constructed from an extensive set of common depth point seismic data demonstrates that the Queenie structure overprints a Miocene extensional basin and is a fault propagation fold that formed as compression changed the normal slip on the basin margin shear zone to reverse slip. Geometric constraints and seismic data suggest that the controlling shear zone dips moderately (30° to 50°) to the northeast and is essentially nonlistric to the base of the brittle crust at a depth of about 12 km. Structural analysis of cross sections further shows that average total post‐Miocene NE‐SW shortening across the Queenie structure is about 3 % (0.39 km across the 13‐km‐wide zone of folding) and that related shortening across the 40‐km‐wide central reach of the offshore Santa Maria Basin between the Hosgri fault and the Santa Lucia Bank fault during the same period is roughly 1–2% (0.4–0.8 km). High‐resolution seismic reflection data show small folds (structural relief less than 10% of the primary Queenie structure) in post‐early/late Pliocene sediments on the southwestern flank of the Queenie structure. These folds exhibit minor coaxial deformation along the flank of the structure, suggesting that very low rates of tectonic folding (of the order of 0.005 mm shortening per year) may continue to the present. The transient nature of the Pliocene compressional event that formed the primary Queenie structure and the relatively low rates of recent seismic activity in the central offshore Santa Maria Basin suggest that postearly/late Pliocene interplate shortening at this latitude has been largely accommodated outside the basin.

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Thalassiosira praeoestrupii: A New Diatom Species for Recognizing the Miocene/Pliocene Epoch Boundary in Coastal California

Cited by 21 publications

References 13 publications

Diatom Stratigraphy of the Lower Pliocene Part of the Sisquoc Formation, Harris Grade Section, California

Diatom Stratigraphy of the Lower Pliocene Part of the Sisquoc Formation, Harris Grade Section, California

Diatom Biostratigraphy: Kerguelen Plateau and Prydz Bay Regions of the Southern Ocean.

Structural Analysis of Late Neogene Deformation in the Central Offshore Santa Maria Basin, California

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