Upper Jurassic Radiolaria and Radiolarian Biostratigraphy of the California Coast Ranges

Pessagno, Emile A.

doi:10.2307/1485310

Cited by 185 publications

(64 citation statements)

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“…Similar (but not identical) Parvicingula species also have been reported in the Middle Jurassic of the Blue Mountains, Oregon (Pessagno and Whalen, 1982) and in other Boreal localities of the Soviet Union (Vishnevskaya, 1988). "Parvicingula"-type forms dominate largely over those of "Ristola'''-type in the sand faunas (for a discussion of the systematic usage of these groups see Pessagno, 1977;Baumgartner, 1984;and Baumgartner, this volume). Pantanelliids are absent from claystone assemblages and are rare in sand assemblages.…”

Section: Discussionmentioning

confidence: 99%

Early Cretaceous Biogeographic and Oceanographic Synthesis of Leg 123 (off Northwestern Australia)

Baumgartner¹,

Bown²,

Marcoux³

et al. 1992

Proceedings of the Ocean Drilling Program

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Section: Discussionmentioning

confidence: 99%

Early Cretaceous Biogeographic and Oceanographic Synthesis of Leg 123 (off Northwestern Australia)

Baumgartner¹,

Bown²,

Marcoux³

et al. 1992

Proceedings of the Ocean Drilling Program

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“…Foraminifera (Dailey, 1973) and two tuff horizons (U-Pb zircon age of 137.1 Ma ϩ1.6/Ϫ0.6 Ma; Bralower et al, 1990) confirm an Early Cretaceous age for the section defined by Cretaceous Buchia zones. Radiolarians recovered near the base of the Great Valley Group were assigned to the Tithonian (Pessagno, 1977) based on the Buchia zones of Jones et al (1969), and thus do not represent an independent age designation.…”

Section: Biostratigraphymentioning

confidence: 99%

Does the Great Valley Group contain Jurassic strata? Reevaluation of the age and early evolution of a classic forearc basin

Surpless

Graham

Covault

et al. 2006

Geol

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The presence of Cretaceous detrital zircon in Upper Jurassic strata of the Great Valley Group may require revision of the lower Great Valley Group chronostratigraphy, with significant implications for the Late Jurassic-Cretaceous evolution of the continental margin. Samples (n ‫؍‬ 7) collected from 100 km along strike in the purported Tithonian strata of the Great Valley Group contain 20 Cretaceous detrital zircon grains, based on sensitive high-resolution ion microprobe age determinations. These results suggest that Great Valley Group deposition was largely Cretaceous, creating a discrepancy between biostratigraphy based on Buchia zones and chronostratigraphy based on radiometric age dates. These results extend the duration of the Great Valley Group basal unconformity, providing temporal separation between Great Valley forearc deposition and creation of the Coast Range Ophiolite. If Great Valley forearc deposition began in Cretaceous time, then sediment bypassed the developing forearc in the Late Jurassic, or the Franciscan subduction system did not fully develop until Cretaceous time. In addition to these constraints on the timing of deposition, pre-Mesozoic detrital zircon age signatures indicate that the Great Valley Group was linked to North America from its inception.

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“…As we stated (MIZUTANI and SHIBATA, 1980) PESSAGNO (1977) in the California Coast Ranges. By referring to the biostratigraphic studies by JONES et al (1969) and IMLAY and JONES (1970), PESSAGNO (1977) central Japan.…”

Section: Introduciionmentioning

confidence: 58%

Isotopic ages of siliceous shale from Hida-Kanayama, central Japan.

Shibata

Mizutani

1980

Geochem. J.

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Whole-rock samples of siliceous shale, assigned to lower Tithonian by radiolarian fossils, from Hida Kanayama give a Rb-Sr isochron age of 128±3Ma.K-Ar ages for these samples range from 125 to 133 Ma except two much older ages, which are perhaps caused by the presence of detrital material. On the basis of the concordance between Rb-Sr and K-Ar ages and the lack of significant thermal event, the age of 128Ma is interpreted as indicating the time when the whole-rock became closed with respect to Rb-Sr system, thus there should be a period of about 20Ma between the deposition and chemical diagenesis.The initial 8°Sr/86Sr ratio for the shale is determined to be 0.7155 ± 0.0004 and much higher than the contemporaneous marine e'Sr/86Sr ratio. This fact suggests the existence of older rocks in the provenance.

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Upper Jurassic Radiolaria and Radiolarian Biostratigraphy of the California Coast Ranges

Cited by 185 publications

References 0 publications

Early Cretaceous Biogeographic and Oceanographic Synthesis of Leg 123 (off Northwestern Australia)

Early Cretaceous Biogeographic and Oceanographic Synthesis of Leg 123 (off Northwestern Australia)

Does the Great Valley Group contain Jurassic strata? Reevaluation of the age and early evolution of a classic forearc basin

Isotopic ages of siliceous shale from Hida-Kanayama, central Japan.

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