Occurence of microfossils in Early Cretaceous sediments of DSDP Hole 25-249 (Tab. 1)

DOI

From 12 radiolarian-rich claystone samples of the DSDP-Leg 25, Site 249, situated in the western Indian Ocean southwest of Madagascar 4 species of agglutinated and 38 species of calcareous benthonic foraminifera are described, 13 of them in open nomenclature. As a lot of Valanginian species and Gavelinella barremiana occur in the foraminiferal faunas described here a Valanginian-Hauterivian age is assigned to them. These microfaunas investigated here yield some index species characteristic in the Lower Cretaceous deposits of Northern Germany and also from the near-by Madagascar. Nodosariids dominate in a striking way with 36 species, especially of Astacolus, Citharina, Lenticulina, Lingulina, Marginulinopsis, Nodosaria, Saracenaria, and Vaginulina. Important Neocomian species well-known from other DSDP sites, namely Praedorothia ouachensis (SIGAL) and planktonic foraminifers, are missing. The microfaunas of Site 249 have to be derived from shelf areas.

R = rare (1-5 specimens), C = common (6-20 specimens), A = abundante (>29 specimens, or dominant occurence with more than 30 %), - = absent. Parameter comments give the global occurence of benthic foraminifera

Supplement to: Riegraf, Wolfgang (1978): Benthonische Schelf-Foraminiferen aus dem Valanginium-Hauterivium (Unterkreide) des Indischen Ozeans südwestlich Madagaskar (Deep Sea Drilling Project Leg 25, Site 249). Geologische Rundschau, 78(3), 1047-1061

Identifier
DOI https://doi.org/10.1594/PANGAEA.669647
Related Identifier https://doi.org/10.1007/BF01829334
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.669647
Provenance
Creator Riegraf, Wolfgang
Publisher PANGAEA
Contributor Berger, Glenn W
Publication Year 1978
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 600 data points
Discipline Earth System Research
Spatial Coverage (36.077 LON, -29.950 LAT); Indian Ocean//RIDGE