4.3 Article

Middle-Upper Devonian palynofloras from Argentina, systematic and correlation

Journal

REVIEW OF PALAEOBOTANY AND PALYNOLOGY
Volume 257, Issue -, Pages 95-116

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.revpalbo.2018.07.009

Keywords

Palynology; Taxonomy; Biostratigraphy; Middle-Upper Devonian; Northwestern Argentina

Funding

  1. CONICET [PIP 11220120100182CO, PIP 11220150100812CO]

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This investigation documents the first palynoassemblage spanning the Middle-Upper Devonian from four outcropping sections located in northwestern Argentina. The recovered material includes fairly well-preserved palynomorphs, both from marine and continental origin, including acritarchs, prasinophytes, cryptospores, spores and chlorophytes. In two of the four studied localities chitinozoans were encountered, whilst only one of them have yielded scolecodonts. Five new species are described including one acritarch specimen: Gorgonisphaeridium impexus sp. nov., two prasinophytes: Cymatiosphaera robusta sp. nov. and Pterospermella simplex sp. nov., one chitinozoan: Angochitina plicata sp. nov. and one miospore species: Apiculatasporites ruptus sp. nov. Hierarchical cluster analysis recognize two well-differentiated palynofloras in Argentina for the Early and Middle-Late Devonian. A poor correlation with known Devonian biostratigraphical schemes from Gondwanan and peri Gondwanan regions, support the theory of an endemic flora in northwestern and eastern Gondwana even during the Middle and Late Devonian. The palynoassemblage studied here provides an important source of reference to improve former strata correlation in the Tarija and neighbouring basins. (C) 2018 Elsevier B.V. All rights reserved.

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