First record of Ginkgo-related fertile organs (Hamshawvia, Stachyopitys) and leaves (Baiera, Sphenobaiera) in the Triassic of Brazil, Santa Maria formation

R Barboni, TL Dutra - Journal of South American Earth Sciences, 2015 - Elsevier
R Barboni, TL Dutra
Journal of South American Earth Sciences, 2015Elsevier
This paper describes new ginkgophytes recently discovered in a new exposure of the
original type section of the Passo das Tropas Member, Santa Maria Formation, linked to
Paraná Basin succession. The well-preserved fossils come from a very fine red laminated
mudstone representing a lacustrine interval, within a broader low-sinuosity fluvial
succession. The material occurs in a Dicroidium-dominated assemblage and is represented
by the leaves Baiera and Sphenobaiera, accompanied by the fertile structures Hamshawvia …
Abstract
This paper describes new ginkgophytes recently discovered in a new exposure of the original type section of the Passo das Tropas Member, Santa Maria Formation, linked to Paraná Basin succession. The well-preserved fossils come from a very fine red laminated mudstone representing a lacustrine interval, within a broader low-sinuosity fluvial succession. The material occurs in a Dicroidium-dominated assemblage and is represented by the leaves Baiera and Sphenobaiera, accompanied by the fertile structures Hamshawvia and Stachyopytis. Cuticle fragments preserved on leaf impressions of Sphenobaiera schenkii show xeromorphic features. The geology, paleogeography and paleoclimate of the Passo das Tropas Member (PTM), Santa Maria Formation, is discussed. By comparing these ginkgophytes with those from other Gondwanan assemblages, the Brazilian deposits earlier assigned to Anisian–Ladinian age can now be extended to the Carnian age.
Elsevier
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