CRETACEOUS CONCHOSTRACANS FROM ALAGOAS BASIN (NORTHEASTERN BRAZIL)

Authors

  • Mitsuru Arai PETROBRAS/CENPES/Biostratigraphy & Paleoecology Section, Rio de Janeiro.
  • Ismar de Souza Carvalho Departamento de Geologia, Instituto de Geociências, Universidade Federal do Rio de Janeiro, Río de Janeiro.

Abstract

Conchostracans from an outcrop of the Maceió Formation (Aptian-Albian, Alagoas Basin) located at Japaratinga Beach (Alagoas State, Brazil) are studied. The fossils comprise a monospecific fauna of Cyzicus pricei Cardoso, a frequent Early Cretaceous species in some Brazilian rift basins. The conchostracans from Maceió Formation occur as non-articulated and articulated valves of brownish color. The articulated valves and well preserved isolated ones are indicative of local burial without significant transport. No other fossil groups were found associated with Cyzicus pricei in Japaratinga Beach outcrops. Their ecological setting was probably similar to Recent environments: temporary ponds of alkaline freshwater. The existence of some Early Cretaceous African species presenting great morphological similarities with Cyzicus pricei [e.g., Cyzicus kasaiensis (Marlière) from Congo Basin] suggests that Brazil and Africa shared common conchostracofaunas during the Early Cretaceous.

KEY WORDS. Brazil. Alagoas Basin. Cretaceous. Aptian. Conchostracans.

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Published

2015-10-01

Issue

Vol. 7 No. 1 (2001)

Section

Thematic Volume

License

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a CC Attribution-NonCommercial 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.