Browsing by Author "Tavera, Juan"
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Item Contribución al conocimiento geológico de la península Byers de la isla Livingston; islas Shetland del sur, Antártica(1970) Gonzalez-Ferran, Oscar; Katsui, Yoshio; Tavera, JuanThe first finding of ammonite fossil remains, in epiclastic and pyroclastic beds of the southwestern end of the Byers Peninsula, Livingston Island, South Shetland Islands Group, Antarctica, is reported, and the structural geology and petrology of the area is briefly described. The species present, Spiticeras (Spiticeras) ef, spitiensis Blandford and Blandfordiceras (Pseudoblandfordiceras) patagorniensis (Favre) Feruglio, indicate upper Titonian to Neocomian. Lava flows are intercalated in the upper levels of the formation, which is also cut by dikes, sills, and conoliths of diorite and basaltic andesite. Six new chemical analyses of the igneous rocks are given.Item Fauna titoniana- neoconiana de Isla Livingston, Islas Shetland del Sur, Antártica(1970) Tavera, JuanA fossil invertebrate fauna from the South-West end of Livingston Island, South Shetland Islands, is described. The fauna, found in marine beds interbedded in a plant-bearing continental sequence, consists of Spiticeras (Spiticeras) spitiensis, Blanfordiceras (Pseudoblanfordia) patagoniense, Favrella cf. steinmanni, Aulacosphinctes cf. spitiensis, Argentiniceras fasciculatus and Hibolites aff. jaculum. The following zones were identified: Cuyaniceras transgrediens, Spiticeras (Kilianiceras) damesi and Kilianiceras burckhardti. The fossils indate an age between late Tithonian and late Barremian; they show affinities with the Tithonian- Neocomian fauna of Southern Patagonia.