(Table 1) Distribution of Lower Cretaceous calcareous nannofossils at DSDP Hole 93-603B ...

• Main Authors: Covington, J Mitchener, Wise, Sherwood W
• Format: Dataset
• Language: English
• Published: PANGAEA 1987
• Subjects: Sample code/label; DEPTH, sediment/rock; Lithologic unit/sequence; Stage; Nannofossil zone; Lithology/composition/facies; Nannofossil abundance; Nannofossils preservation; Assipetra infracretacea; Axopodorhabdus dietzmannii; Biscutum sp.; Braarudosphaera discula; Braarudosphaera regularis; Calcicalathina oblongata; Chiastozygus litterarius; Chiastozygus striatus; Chiastozygus tenuis; Conusphaera mexicana; Corollithion achylosum; Corollithion acutum; Corollithion ellipticum; Corollithion conicus; Cretarhabdus crenulatus; Cretarhabdus sp.; Cruciellipsis cuvillieri; Cruciplacolithus hayi; Cyclagelosphaera deflandrei; Cyclagelosphaera margerelii; Diadorhombus rectus; Diazomatolithus lehmanii; Diloma placinum; Diloma primitivum; Discorhabdus biradiatus; Discorhabdus ignotus; Eiffellithus sp.; Ethmorhabdus hauterivianus; Glaukolithus diplogrammus; Grantarhabdus coronadventis; Grantarhabdus meddii; Haqius circumradiatus; Hayesites irregularis; Lithraphidites alatus ssp. magnus; Lithraphidites carniolensis; Manivitella sp.; Manivitella pemmatoidea; Micrantholithus hoschulzii; Micrantholithus obtusus; Micrantholithus sp.; Microstaurus chiastius; Microstaurus conus; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.788888; https://doi.pangaea.de/10.1594/PANGAEA.788888

Upper Berriasian to lower Aptian calcareous nannofossil assemblages have been studied from a siliciclastic deep-sea fan complex and a subjacent limestone sequence drilled beneath the lower continental rise in the western North American Basin, 270 miles (435 km) off Cape Hatteras, North Carolina (USA). Sharp lithologic facies changes and reworking by turbidites complicate the biostratigraphic interpretation, but provide an excellent opportunity to better distinguish "nearshore" from open-ocean nannofossil species, and to investigate the introduction of neritic taxa into the deep-see environment, a phenomenon that appears to have been widespread within the circum-North Atlantic during Neocomian times. Well-preserved assemblages in dark, carbonaceous claystones were probably displaced from the oxygen minimum zone along the upper slope or outer shelf. Neritic, continental margin species prevalent in this facies include the holococcolith Zebrashapka vanhintei n. gen., n. sp., Lithraphidites alatus magnus n. spp., ... : Sediment depth is given in mbsf. 93-603B-44-1,18-19 and 93-603B-44-4,7-8 samples barren. V = very abundant, A = abundant, C = common, R = rare, #R = SEM only, G = good, M = moderate, P = poor. ...