Occurrence of late Aptian/earliest Albian radiolaria from ODP Hole 113-693A (Table 2)

• Main Authors: Ling, Hsin Yi, Lazarus, David B
• Format: Dataset
• Language: English
• Published: PANGAEA 1990
• Subjects: 113-693A; Acanthocircus bispinus; Acanthocircus sp.; Actinomma sp.; Archaeodictyomitra squinaboli; Archaeospongoprunum sp.; Artostrobus sp.; Cornutella californica; Counting >63 µm fraction; Diacanthocapsa sp.; Dictyomitra sp.; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Gorgansium sp.; Joides Resolution; Leg113; Napora durhami; Napora sp.; Ocean Drilling Program; ODP; Patulibracchium sp.; Protostichocapsa stocki; Protostichomitra pentacolaensis; Sample code/label; Sethocapsa leiostraca; Spongocyclia trachodes; Spongodiscus sp.; Spongodiscus spp.; Squinabolella putahensis; Stichomitra sp.; Theocorys sp.; Tricolocapsa sp.; Tripodictya elegantissima; Weddell Sea; Antarctic; Antarctic Ocean; The Antarctic; Weddell; Antarc*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.746523; https://doi.org/10.1594/PANGAEA.746523

Unusually well preserved Cretaceous radiolarians are observed in the subsurface sections from two drilled sites in the Weddell Sea collected during Leg 113 of the Ocean Drilling Program. Radiolarians from the lithified calcareous chalk of Hole 689B represent the first Campanian-Maestrichtian assemblage which is characterized by abundant Cromyodruppa Iconcentrica, Dictyomitra multicostata, and Protostichocapsa stocki. Abundant Pseudodictyomitra pentacolaensis and Diacanthocapsa sp. 1, on the other hand, are the main constituents of the assemblage from the latest Aptian/earliest Albian diatomite of Hole 693B. These represent the oldest and the highest-latitude reported radiolarian occurrences from the Atlantic sector of the Antarctic Ocean. The assemblages are marked by their low diversity and an absence of low- to mid-latitude zonal indices.