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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 19 (1969), Pages 509-528

Late Neogene Palynomorph Diagrams, Northern Gulf of Mexico

William C. Elsik (1)


The cyclic nature of Late Neogene climate is reflected in the relative frequency diagrams of palynomorphs deposited in the northern Gulf of Mexico. A general cooling through the Late Neogene and at least five glacial cycles for the Quarternary are indicated. An additional prominent cold cycle in latest Miocene time is interpreted from the frequency diagram of Picea, spruce. The Pliocene-Pleistocene boundary is marked by an abundance of Ambrosia and Helianthus types of Compositae pollen below and increased frequency of Alnus and Exesisporites above. The fungal spore Exesisporites neogenicus, n. gen., n. sp., occurs abundantly in the lower part of the Pleistocene and again lower in the Neogene.

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