Articles | Volume 22, issue 2
J. Micropalaeontol., 22, 113–126, 2003
https://doi.org/10.1144/jm.22.2.113
J. Micropalaeontol., 22, 113–126, 2003
https://doi.org/10.1144/jm.22.2.113

  01 Nov 2003

01 Nov 2003

New charophytes from the Upper Jurassic of the Lusitanian Basin (Portugal)

Ricardo Pereira1, Monique Feist2, and Ana C. Azerêdo3 Ricardo Pereira et al.
  • 1Partex Oil & Gas, Av. Republica, 50, 4° Lisbon 1050-196, Lisbon, Portugal and Centro de Geologia da Universidade de Lisboa, Campo Grande, Ed. C2 - 5° Piso, 1749-016, Lisbon, Portugal (e-mail: )
  • 2Laboratoire de Paléobotanique, Université Montpellier, Place Eugène Bataillon F-34095 Montpellier Cedex 05, France (e-mail: )
  • 3Departamento de Geologia and Centro de Geologia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C2 - 5° Piso, 1749-016, Lisbon, Portugal (e-mail: )

Abstract. In the Lusitanian Basin (west-central Portugal), Upper Jurassic (Oxfordian) sediments were investigated in order to identify palaeontological assemblages of charophytes. Systematic studies were undertaken on specimens obtained from four field sections (Pedrógão, Vale de Ventos, Memória and Valverde). These studies revealed the presence of new forms of Porocharaceae (Porochara pedunculata n. sp) and of forms previously unknown in this region (Auerbachichara cf. saidakovskyi), as well as P. raskyae, P. minima, P. fusca, P. sulcata, P. kimmeridgensis, Aclistochara longiformis and Porochara sp. Comparison of the charophyte palaeofloras recognized in all of the studied sections has allowed the definition of three different assemblages which, coupled with other data, help to correlate these successions of Early (?) to Middle (Late?) Oxfordian age.