Pliocene- Pleistocene radiolarians from the East Pacific Rise and the Galapagos spreading center, Deep Sea Drilling Project Leg 54 ( DSDP).

Abstract

On Leg 54, a total of 760.9m of sediment was penetrated, of which 391.5m was recovered. In all, 331 samples were prepared and examined for radiolarians, which comprise a diverse fauna exhibiting variable degrees of preservation. A small fraction (28 taxa) of this assemblage from the E Pacific Rise and Galapagos Spreading Center are discussed and tabulated from this sample set. A modified radiolarian biozonation is proposed for correlating the recovery from the 16 holes drilled on Leg 54. 7 new biozones are defined. 5 new taxa include: Amphispyris roggentheni, Neosemantis hofferti, Nephrospyris renilla lana, Pseudocubus warreni, and Sphaerozoum crassus. -Author