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Diverse, siliceous microfossil assemblages—including marine diatoms, silicoflagellates, ebridians, endoskeletal dinoflagellates, chrysophyte cysts (archaeomonads), radiolarians, and sponge spicules—were recovered from Seymour Island. Their stratigraphic occurrence is documented from the ~l,400-m-thick section of the López de Bertodano (upper Campanian into lower Paleocene) and Sobral (lower Paleocene) Formations. These units consist of detrital silt and fine sand deposited in a quiet shelf environment. The following new diatoms are proposed: Coscinodiscus sparsus, Gladius antarcticus, Gladius antarcticus f. alta, Hemiaulus huberi, Hemiaulus seymouriensis, Pterotheca minor, Pterotheca trojana, and Wittia macellarii.

The microfossil assemblages compare well with floras of similar age from diatomites in the Ural...

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