(Table T1) Cenozoic and Mesozoic biostratigraphic datums of ODP Hole 210-1276A

• Main Authors: Urquhart, Elspeth, Gardin, Silvia, Leckie, R Mark, Wood, S A, Pross, Jörg, Georgescu, Marius Dan, Ladner, Bryan, Takata, Hiroyuki
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: 210-1276A; Age model; Ageprofile Datum Description; Depth; bottom/max; sediment/rock; top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg210; North Atlantic Ocean; Ocean Drilling Program; ODP; Sample code/label; Sample code/label 2; Sample comment; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.776761; https://doi.org/10.1594/PANGAEA.776761

Sediments recovered from Ocean Drilling Program Leg 210 Hole 1276A range in age from Early Cretaceous (earliest Albian) to Paleogene (earliest Oligocene). In this study, samples were processed and analyzed for micropaleontological and palynological content, as well as sedimentary components. Core recovery from this site was good (85% between 800 and 1725.16 meters below seafloor), and the majority of samples processed yielded microfossils of some nature. Although none of the major groups are consistently present in all samples, calcareous nannofossils, agglutinated benthic foraminifers, and radiolarians do occur in many samples. The best age constraints for Hole 1276A are provided by calcareous nannofossils and dinoflagellate cysts. Age-diagnostic planktonic foraminifers are more commonly found in redeposited turbidite sandstones rather than in the autochthonous pelagic mudrocks. The depositional environments of the sediments have been interpreted as varying in oxygenation but having been deposited at abyssal depths (>2000 m) near or below the calcite carbonate depth (CCD). Almost uninterrupted deepwater deposition since the Aptian is evidenced both by the evolutionary succession of biota recovered from the sediments and by the sedimentary history of turbidites and gravity flow deposits derived from neritic and bathyal sources on the adjacent margin. A condensed interval recorded in the Turonian-Maastrichtian is likely associated with sediment starvation at times of high global sea level. A disconformity and condensed interval in the lower middle Eocene (~48.5-43.7 Ma) is associated with a change in global sea level and may be associated with invigorated deepwater current activity. Anoxic conditions affected the deep seafloor of the North Atlantic during Oceanic Anoxic Event (OAE) 1b (earliest Albian, ~112 Ma) and OAE2 (Cenomanian-Turonian boundary interval, ~93.5 Ma). Cooling during the early Turonian followed the vast carbon burial associated with OAE2 based on calcareous nannofossil assemblages. The ...