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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1990
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| Online Access: | https://doi.org/10.1594/PANGAEA.746421 |
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| _version_ | 1867167664529473536 |
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| author | Mutterlose, Jörg Wise, Sherwood W |
| author_facet | Mutterlose, Jörg Wise, Sherwood W |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Organic-rich, moderately to sparsely nannofossiliferous Lower Cretaceous claystones ("black shales") were cored at two Ocean Drilling Program Leg 113 sites on the continental slope of East Antarctica off Dronning Maud Land. A 39 m section at Site 692 yielded a Neocomian assemblage of limited diversity with rare Cyclagelosphaera deflandrei, Diadorhombus rectus, and Cruciellipsis cuvillieri, and is probably Valanginian in age. A 70-m section at Site 693 is assigned to the Rhagodiscus angustus Zone (late Aptian-early Albian in age). The latter zone is represented at DSDP sites on the Falkland Plateau, but equivalents to the Neocomian section are absent there, probably due to a disconformity. Watznaueria barnesae is the dominant species at both ODP sites, but it shares dominance with Repagulum parvidentatum at Site 693, where they total 70%-90% of the assemblage; their dominance is attributed to a paleogeographic setting within a restricted basin rather than to postdepositional dissolution of other species. The evolutionary development of this restricted basin and its eventual ventilation in early Albian times is discussed in terms of the regional stratigraphy and the breakup and dispersal of southwestern Gondwanaland. One new species, Corollithion covingtonii, is described. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_746421 |
| institution | PANGAEA |
| language | en |
| publishDate | 1990 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Lower Cretaceous nannofossils of ODP Holes 113-682B and 113-693A Mutterlose, Jörg Wise, Sherwood W 113-692B; 113-693A; DRILL; Drilling/drill rig; Joides Resolution; Leg113; Ocean Drilling Program; ODP; Weddell Sea Organic-rich, moderately to sparsely nannofossiliferous Lower Cretaceous claystones ("black shales") were cored at two Ocean Drilling Program Leg 113 sites on the continental slope of East Antarctica off Dronning Maud Land. A 39 m section at Site 692 yielded a Neocomian assemblage of limited diversity with rare Cyclagelosphaera deflandrei, Diadorhombus rectus, and Cruciellipsis cuvillieri, and is probably Valanginian in age. A 70-m section at Site 693 is assigned to the Rhagodiscus angustus Zone (late Aptian-early Albian in age). The latter zone is represented at DSDP sites on the Falkland Plateau, but equivalents to the Neocomian section are absent there, probably due to a disconformity. Watznaueria barnesae is the dominant species at both ODP sites, but it shares dominance with Repagulum parvidentatum at Site 693, where they total 70%-90% of the assemblage; their dominance is attributed to a paleogeographic setting within a restricted basin rather than to postdepositional dissolution of other species. The evolutionary development of this restricted basin and its eventual ventilation in early Albian times is discussed in terms of the regional stratigraphy and the breakup and dispersal of southwestern Gondwanaland. One new species, Corollithion covingtonii, is described. |
| title | Lower Cretaceous nannofossils of ODP Holes 113-682B and 113-693A |
| topic | 113-692B; 113-693A; DRILL; Drilling/drill rig; Joides Resolution; Leg113; Ocean Drilling Program; ODP; Weddell Sea |
| url | https://doi.org/10.1594/PANGAEA.746421 |