26. DINOFLAGELLATE AGE OF MIDDLE JURASSIC-EARLY CRETACEOUS SEDIMENTS IN
Biostratigraphic datums of stratigraphically useful dinoflagellates are used to date the Jurassic-Cretaceous sequence in Hole 534A drilled by the Deep Sea Drilling Project. The investigated interval is dated middle Callovian through Vra-conian Albian in the 875-m-thick section represented by Cores 5...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.6090 http://www.deepseadrilling.org/76/volume/dsdp76_26.pdf |
| Summary: | Biostratigraphic datums of stratigraphically useful dinoflagellates are used to date the Jurassic-Cretaceous sequence in Hole 534A drilled by the Deep Sea Drilling Project. The investigated interval is dated middle Callovian through Vra-conian Albian in the 875-m-thick section represented by Cores 534A-127 to 534A-27. Dinoflagellates date the new, low-ermost, unnamed lithostratigraphic unit at Hole 534A as middle Callovian through Oxfordian, with basal Kimmeridgi-an sediments occurring in the approximate position of the boundary with the overlying Cat Gap Formation. The zoned Cretaceous interval in Holes 534A and 391C in the Blake-Bahama Basin ranges from the late Berriasian through the Vraconian. A zonation is proposed for the stratotype and parastratotype sections of sediments deposited in the European Tethys during the Neocomian (early Berriasian-late Hauterivian). It shows the same chronostratigraphic succession of species common to the Tethys of both North Atlantic and Europe. On the basis of scanning electron micrograph evidence, the epicystal tabulation of Druggidium apicopaucicum Habib is revised. |
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