Molluscan Systematics and Biostratigraphy: Lower Tertiary La

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Published by means of the yankee Geophysical Union as a part of the Antarctic learn Series.

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Extra info for Molluscan Systematics and Biostratigraphy: Lower Tertiary La Meseta Formation, Seymour Island, Antartic Peninsula

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Along the seacliffs along the east DEPOSlTIONAL ENVIRONMENTS AND PALEOECOLOGY coast, several channels have large slump blocks with well-developed neptunian dike fillings. It is apparent that after the slumping event, bottom-current action fillcd the fissures between the slump blocks with coarse shelly sands. Telm6 and Telm7 (Unit VI and Unit VII) The uppermost uni~s (Telm6 and Telm7) were deposited in a generally low-energy, shallow-marine environment. , vencrid beds) and isolated shell lenses indicate punctuated higher-energy intervals.

A few taxa from the upper units of the La Meseta Formation, however, are similar to southern South American forms. 17 index of similarity on the generic level. It is apparent that the Weddellian Faunal Province began to lose its identity well before early to middle Eocene as a consequence of the breakup of Gondwana. The resultant geographic isolation and allopatric speciation lead to the development of extreme individuality of the early Tertiary faunas along the Antarctic Peninsula. SYSTEMATIC PALEONTOLOGY During the course of this investigation a total of 170 species of molluscs were recognized from the La Meseta Formation.

I ........... ........... .................. ................. ........... :.. I I I I Sportellidae Anisodonta truncilla n. sp. Anisodonta subovata n. sp. Carditidae Cyclocardia mesembria n. sp. Crassatellidae Eucrassatella wilckensi I (Medina and Rinaldi, 1978) Lahilliidae Lahillia wilckensi Zinsmeister, 1984 Mactridae Oxyperas (Pseudoxyperas) ortrnanni Zinsmeister, 1984 Mactra irizari Wilckens, 1911 Mactra (Maorimuctra) bodrnani n. sp. Standella mystrosura n.

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