New chitinozoan species from the Devonian of the Paraná Basin, south Brazil, and their biostratigraphic significance

Authors

  • Kariny de Amorim Gaugris
  • Yngve Grahn

Abstract

Abstract. Devonian chitinozoans from two wells in the north-northwestern outcrop belt of the Paraná Basin, and three in the eastern outcrop belt of the same basin, have been investigated for this study. A new, hitherto undescribed chitinozoan assemblage of Early Devonian, pre-late Emsian age is recognized above the Ramochitinamagnifica Lange interval range Zone, in addition to new species from younger Devonian beds. A new Early Devonian biozone, the Ancyrochitinapachycerata interval range Zone, is erected. Altogether, 16 new species are described of which 10 are left in open nomenclature due to insufficient number of well-preserved specimens. The biostratigraphy of the new chitinozoan species is compared with the chitinozoa and miospore zones previously recognized in the Paraná Basin, and to standard conodont zonation. Resumen. NUEVAS ESPECIES DE QUITINOZOOS DEL DEVÓNICO DE LA CUENCA DE PARANÁ, SUR DE BRASIL, Y SU SIGNIFICADO BIOESTRATIGRÁFICO. Se han estudiado quitinozoos devónicos de dos sondeos en el cinturón de afloramientos del nor-noroeste de la cuenca de Paraná, y de tres sondeos en el cinturón de afloramientos oriental de la misma cuenca. Se ha identificado una nueva asociación de quitinozoos, no descrita anteriormente para el Devónico inferior, con edad anterior al Emsiano tardio, y situada por encima de la Zona de rango interval de Ramochitinamagnifica Lange, además de otras nuevas especies en capas devónicas más jóvenes. Se describe y propone una nueva biozona para el Devónico inferior: la Zona de rango interval de Ancyrochitinapachycerata. En conjunto, se describen 16 nuevas especies, de las cuales 10 quedan en nomenclatura abierta debido al insuficiente número de especímenes bien preservados. Se compara la bioestratigrafía de las nuevas especies de quitinozoos con las zonas de quitinozoos y esporas previamente identificadas en la cuenca de Paraná, y con la zonación estándar de conodontos.

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Published

2013-03-06

Issue

Vol. 43 No. 2

Section

Articles

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How to Cite

New chitinozoan species from the Devonian of the Paraná Basin, south Brazil, and their biostratigraphic significance. (2013). Ameghiniana, 43(2), 293-310. https://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/760