Jurassic Calcareous Nannofossil Zonation, an Overview with New Evidence from Deep Sea Drilling Project Site 534

Roth, P.H.; Medd, A.W.; Watkins, D.K.

doi:10.2973/dsdp.proc.76.123.1983

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…The middle part (beds L75-L79) is formed by rosegrey biomicrite of the radiolarian-Saccocoma-Globochaete microfacies (packstone, wackestone). The (Houša et al 1996(Houša et al , 1999 Roth et al 1983; emended by Bralower et al 1989) within the range of the Middle Tithonian; Magnetochron M21n to M20n (after Bralower et al 1989). The assemblages of the lower part of this interval are typified by the predominance of Conusphaera mexicana mexicana, accompanied by Conusphaera mexicana minor, Watznaueria barnesae, and Watznaueria manivitae.…”

Section: Sequence Stratigraphy and Biostratigraphymentioning

confidence: 95%

“…5) is dominated by Conusphaera mexicana mexicana, Conusphaera mexicana minor, Cyclagelosphaera margerelii, Cyclagelosphaera deflandrei, Watznaueria barnesae, and Watznaueria manivitae. The absence of the nannolith Polycostella beckmannii in the association permits parallelization of this part of the sequence with the Early Tithonian Hexapodorhabdus cuvillieri (NJ 20-A) Subzone of the Conusphaera mexicana mexicana Zone (Roth et al 1983; emended by Bralower et al 1989).…”

Section: Sequence Stratigraphy and Biostratigraphymentioning

confidence: 99%

See 1 more Smart Citation

The Brodno section — a potential regional stratotype of the Jurassic/Cretaceous boundary (Western Carpathians)

Michalı́k¹,

Reháková²,

Halásová³

et al. 2009

Geologica Carpathica

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Compared to coeval successions from the Carpathians, the continuous Jurassic-Cretaceous (J/K) pelagic limestone succession of the Brodno section offers the best possibility to document the J/K passage in a wide area. This section comprises a complete calpionellid, and nannofossil stratigraphic record, that supports the older paleomagnetic data. Moreover, the sequence stratigraphy and stable isotope (δ 18 O, δ 13 C) data gave important results, too, enabling comparison with known key sections from the Mediterranean Tethys area.Key words: J/K boundary, Western Carpathians, regional stratotype, stable isotopes, biostratigraphy, microfossils, pelagic carbonates. Geological context of the Brodno section: an overviewThe Brodno section is situated in an abandoned quarry on the eastern side of the narrow straits of the Kysuca River Valley north of the town of Žilina (known as the "Kysuca Gate", Fig. 1). It yields a record of hemipelagic marine sedimentation in a marginal zone (the Pieniny Klippen Belt) of the Outer Western Carpathians. The lithology, fossil record (including ammonites and aptychi) and stratigraphy were studied by Andrusov (1938Andrusov ( , 1950Andrusov ( , 1959, Scheibner (1961, 1962, 1967), Borza (1969, Scheibnerová (1969), andSamuel et al. (1988). A more detailed description of the Upper Jurassic and Lower Cretaceous litho-and biostratigraphy was provided by Michalík et al. (1990), Vašíček et al. (1992). Houša et al. (1996) introduced the magnetostratigraphy of the Jurassic/Cretaceous (J/K) boundary beds correlated with the microbiostratigraphic data.This paper discusses the results of an integrated biostratigraphic study using three microplankton groups (calpionellids, calcareous dinoflagellates and nannofossils), as well as stable isotope data (δ 18 O, δ 13 C) in the Brodno section, which is proposed here as the candidate for a West Carpathian regional J/K boundary stratotype. The distribution of the stratigraphically important planktonic organisms revealed several coeval calpionellid and nannofossil bioevents recorded in the pelagic carbonate sequence of the Jurassic/Cretaceous boundary age. The stable isotope data underline environmental changes during the interval studied.According to the International Commission on Jurassic Stratigraphy, it is necessary to search for complete sections, which can provide continuous records of both sedimentation and biotic events across stage boundaries. Although the Brodno section lacks ammonite record, it is presented here as a potential candidate considering its continuously well exposed and biostratigraphically properly documented succession, at least for the West Carpathian region. Material and methodsThe Jurassic/Cretaceous boundary succession was studied using an integrated sequence-, bio-and isotope stratigraphy approach from the detailed rock section sampled. A quantitative microfacies analysis was carried in thin sections for the sequence stratigraphic pattern of these pelagic limestones (see Reháková 2000a; Michalík 2007). The calpionellids an...

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Section: Sequence Stratigraphy and Biostratigraphymentioning

confidence: 95%

Section: Sequence Stratigraphy and Biostratigraphymentioning

confidence: 99%

The Brodno section — a potential regional stratotype of the Jurassic/Cretaceous boundary (Western Carpathians)

Michalı́k¹,

Reháková²,

Halásová³

et al. 2009

Geologica Carpathica

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“…For the Middle Jurassic to Lowermost Cretaceous interval, data from DSDP Leg 27, Site 261 were used and include those of Proto Decima (1974) and Cooper (1984). Other zonal schemes employed include Thierstein (1976), Roth et al (1983), Bralower (1987, and Bown et al (1988). In the Triassic and Lower Jurassic, data from Bown (1987), Bown et al (1988), and Bown and Lord (in press) were used.…”

Section: Calcareous Nannofossilsmentioning

confidence: 99%

Explanatory Notes

1990

Proceedings of the Ocean Drilling Program

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“…Fiir die vorliegende Bearbeitung standen keine Mikrofaunen aus dem Callovium-Tithonium yon Site 534A zur Verfiigung, das vergleichsweise sehr pr'~izise datiert ist (REMANE, 1983;ROTH, MEDD & WATKINS, 1983). Line detaillierte stratigraphische Verbreitungstabelle mit den einzelnen Foraminiferenarten fehlt in GRADSTEIN (1983).…”

Section: Marginulinopsis Matutina (D'orbignyunclassified

Oberjura-Foraminiferen aus dem Nord- und Südatlantik (Deep Sea Drilling Project Leg 1–79)

Riegraf¹,

Luterbacher

1989

Geol Rundsch

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Mit 6 Abbildungen, 4 Tafeln und 9 Tabellen ZusammenfassungDie Foraminiferenfaunen des Oxfordium-Tithonium aus den DSDP- Legs 1, 11, 36, 41, 44, 50 und 79 des Nord-und Siidatlantiks wurden biostratigraphisch, taxonomisch und pal~io6kologisch bearbeitet und eine l[)bersicht iiber die in Leg 1-79 erbohrten Jura-Abschnitte und ihre Foraminiferenbearbeitungen gegeben. Im Nordatlantik finden sich vom Oxfordium-Unteren Tithonium in der rotbraunen, feinklastisch-karbonatischen und radiolarienreichen Cat-Gap-Formation mehr oder weniger einheitliche, reichhaltige, aber oft ~,llochthone Schelf-Foraminiferenfaunen von mitteleurop~i-schem Charakter. Das Callovium und h6here Tithonium bleiben wegen fehlender Leitformen unzoniert. Die Pseudomarssonella durnortieri-Zone umfaflt das Oxfordium-Kimmeridgium, die Neobulimina atlantica.Zone das Kimmeridgium-Untertithonium. Ab dem Oberen Tithonium fehlen wegen durchgreifender Schichtliicken (weltweite Regression) im gesamten Nordatlantik-Bereich und in weiten Teilen Europas bis in das Valanginium charakteristische Foraminiferen-Faunen. Eine biostratigraphische Untergliederung in die einzelnen Stufen ist nicht m6glich. Die yon MOULLADE (1984) begriindeten Foraminiferen-Zonen vom CalloviumTithonium sind wegen der groflen stratigraphischen Reichweite der verwendeten Foraminiferenarten h6chstens lokal in der Tethys anwendbar. Taxonomische Unsicherheiten bestehen, well bestimmte Arten im Jura anders benannt wurden als in der Unterkreide. Ferner sind der ForaminiferenBiostratigraphie in den im DSDP erbohrten Abfolgen durch bohrtechnische, pal~io-ozeanographische, biologische und geologische Griinde sehr enge Grenzen gesetzt. Urspriinglich als ,,bathyal,, oder ,,abyssal,, beschriebene Foraminiferenfaunen aus Bohrkernen des DSDP erwiesen sich als vermutlich aus flacherem Wasser verfrachtet und stehen im Gegensatz zu den sedimentologisch-pal~iogeographisch bestimmten Pal~io-Wassertiefen von 3000-4000 m (H~RB & SCHEIBNEROvk, 1977). AbstractBiostratigraphical, taxonomical, and palaeocological results were obtained from Oxfordian to Tithonian foraminifers of

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Jurassic Calcareous Nannofossil Zonation, an Overview with New Evidence from Deep Sea Drilling Project Site 534

Cited by 10 publications

References 7 publications

The Brodno section — a potential regional stratotype of the Jurassic/Cretaceous boundary (Western Carpathians)

The Brodno section — a potential regional stratotype of the Jurassic/Cretaceous boundary (Western Carpathians)

Explanatory Notes

Oberjura-Foraminiferen aus dem Nord- und Südatlantik (Deep Sea Drilling Project Leg 1–79)

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