| _version_ | 1867168050349867008 |
|---|---|
| author | Riegraf, Wolfgang |
| author_facet | Riegraf, Wolfgang |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_669647 |
| institution | PANGAEA |
| language | en |
| publishDate | 1978 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Occurence of microfossils in Early Cretaceous sediments of DSDP Hole 25-249 (Tab. 1) Riegraf, Wolfgang 25-249; Ammobaculites sp.; Astacolus cephalotes; Astacolus microdictyotus; Citharina harpa; Citharina sp.; Citharina truncata; Deep Sea Drilling Project; Dentalina debilis; Dentalina sp.; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eoguttulina bilocularis; Fish remains; Foraminifera, benthic; Gavelinella barremiana; Globulina bucculenta; Glomar Challenger; Glomospirella gaultina; Indian Ocean//RIDGE; Leg25; Lenticulina nodosa; Lenticulina roemeri; Lenticulina saxonica; Lingulina biformis; Lingulina lamellata; Lingulina semiornata; Lingulina sp.; Lithologic unit/sequence; Marginulina caelata; Marginulina inaequalis; Marginulinopsis bettenstaedti; Marginulinopsis matutina; Nodosaria obscura; Nodosaria sp.; Ophiuroidea remains; Ostracoda; Paalzowella feifeli; Palmula crepidularis; Palmula malakialinensis; Palmula sp.; Porifera spiculae; Pseudonodosaria humilis; Radiolarians abundance; Ramulina tappanae; Reophax aff. eckernex; Reophax sp.; Sample code/label; Saracenaria crassicosta; Saracenaria lutanata; Tristix acutangulus; Vaginulina recta 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. |
| title | Occurence of microfossils in Early Cretaceous sediments of DSDP Hole 25-249 (Tab. 1) |
| topic | 25-249; Ammobaculites sp.; Astacolus cephalotes; Astacolus microdictyotus; Citharina harpa; Citharina sp.; Citharina truncata; Deep Sea Drilling Project; Dentalina debilis; Dentalina sp.; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Eoguttulina bilocularis; Fish remains; Foraminifera, benthic; Gavelinella barremiana; Globulina bucculenta; Glomar Challenger; Glomospirella gaultina; Indian Ocean//RIDGE; Leg25; Lenticulina nodosa; Lenticulina roemeri; Lenticulina saxonica; Lingulina biformis; Lingulina lamellata; Lingulina semiornata; Lingulina sp.; Lithologic unit/sequence; Marginulina caelata; Marginulina inaequalis; Marginulinopsis bettenstaedti; Marginulinopsis matutina; Nodosaria obscura; Nodosaria sp.; Ophiuroidea remains; Ostracoda; Paalzowella feifeli; Palmula crepidularis; Palmula malakialinensis; Palmula sp.; Porifera spiculae; Pseudonodosaria humilis; Radiolarians abundance; Ramulina tappanae; Reophax aff. eckernex; Reophax sp.; Sample code/label; Saracenaria crassicosta; Saracenaria lutanata; Tristix acutangulus; Vaginulina recta |
| url | https://doi.org/10.1594/PANGAEA.669647 |