Absolute abundances of benthic and planktonic foraminifers in samples of ODP Hole 149-901A (Table 1)

• Main Authors: Collins, Eric S, Kuhnt, Wolfgang, Scott, David B
• Format: Dataset
• Language: English
• Published: PANGAEA 1996
• Subjects: 149-901A; Benthic foraminifera zone; Bolivina aff. liasica; Counting >63 µm fraction; Dentalina debilis; Dentalina seorsa; Dentalina spp.; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eogutulina aff. liassica; Epistomina spp.; Epistomina uhligi; Foraminifera; planktic; Frondicularia spp.; Glomospira charoides; Glomospira irregularis; Glomospira variabilis; Joides Resolution; Lagena ex gr. L. hauteriviana; Lagena ex gr. L. ovata; Lagena ex gr. L. sulcata; Leg149; Lenticulina muensteri; Lenticulina quenstedti; Lenticulina sp.; Lingulina franconica; Marginulinopsis phragmites; Neobulimina atlantica; Nodobacularia bulbifera; Nodosaria raphanistriformis; North Atlantic Ocean; Ocean Drilling Program; ODP; Ophthalmidium oxfordianum; Ophthalmidium rotula; Ostracoda; Paleogaudryina magharaensis; Planularia sp.; Sample code/label; Saracenaria spp.; Spirilina polygyrata; Stage; Trocholina spp.; Vaginulina cf. jurassica; Vaginulina manubrium; Volume; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.761572; https://doi.org/10.1594/PANGAEA.761572

Dark gray laminated silty claystones (Unit II) drilled at Site 901 contain Tithonian benthic foraminifer assemblages that indicate a neritic depositional environment and probably dysaerobic bottom-water conditions. Three benthic foraminifer zones are distinguished within Unit II. The upper part of the unit is dominated by Spirillina polygyrata, contains Globospirillina spp. (Samples 149-901A-3R-1, 10-12 cm, to 149-901A-3R-1, 75-77 cm) and is interpreted as late Tithonian. Samples 149-901A-3R-1, 87-89 cm, to 149-901A-6R-1, 74-76 cm, contain Epistomina uhligi and Lingulina franconica and are probably early Tithonian. The early Tithonian Neobulimina atlantica Zone is characterized by the occurrence of the zonal marker and Epistomina uhligi and reaches from Sample 149-901A-6R-1, 128-130 cm, to the base of the drilled-sequence. The sediments and benthic foraminiferal assemblage characteristics of the Tithonian-aged sequence in Hole 901A are unknown elsewhere in the Atlantic and may represent deposition in a marginal shelf basin with increased terrigenous and organic flux.