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

2003 ◽  
Vol 22 (2) ◽  
pp. 113-126 ◽  
Author(s):  
Ricardo Pereira ◽  
Monique Feist ◽  
Ana C. Azerêdo
Keyword(s):  
Upper Jurassic ◽  
West Central ◽  
Central Portugal ◽  
Definition Of ◽  
Lusitanian Basin

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.

scholarly journals A re-examination of the Pliensbachian and Toarcian Ostracoda of Zambujal, west-central Portugal

1998 ◽  
Vol 17 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Ian Boomer ◽  
Nigel R. Ainsworth ◽  
John Exton
Keyword(s):  
Environmental Conditions ◽  
Present Material ◽  
Faunal Turnover ◽  
Taxonomic Review ◽  
West Central ◽  
Northwest Europe ◽  
Central Portugal ◽  
The Village ◽  
Lusitanian Basin

Abstract. Pliensbachian and Toarcian Ostracoda first described by Exton (Geological Paper, Carleton University, Ottawa, 79: 1–104 1979) from the Lusitanian Basin, west-central Portugal have been re-examined. As a result, a greater diversity in the Ostracoda (80 species) is now recognized. Two species are newly described (Eucytherura zambujalensis sp. nov., Ektyphocythere mediodepressa sp. nov.) from the marls and calcareous shales of the Maria Pares Hill section near the village of Zambujal. Poor preservation precludes a complete taxonomic review of the present material. Five ostracod zones are proposed; Gammacythere ubiquita–Ogmoconchella gruendeli Zone, Poly cope cerasia–Polycope cincinnata Zone, Liasina lanceolata–Ogmoconcha convexa Zone, Bairdiacypris rectangularis–Kinkelinella sermoisensis Zone, and Cytherella toarcensis-Kinkelinella costata Zone. Although the ostracod assemblages possess strong similarities to those described from Northwest Europe, some of the Zambujal assemblages are dominated by the genus Polycope. A marked faunal turnover, in association with the extinction of the Metacopina occurs in the lower Subzone of the tenuicostatum Zone of Lower Toarcian age. These faunal events are discussed in relation to changing environmental conditions.

Regional seismic mapping of the Lusitanian Basin, West Central Portugal

1996 ◽  
Author(s):  
S. Lomholt ◽  
O. V. Vejbæk ◽  
E. S. Rasmussen ◽  
C. Andersen
Keyword(s):  
West Central ◽  
Central Portugal ◽  
Lusitanian Basin

scholarly journals Turiasauria-like teeth from the Upper Jurassic of the Lusitanian Basin, Portugal

2015 ◽  
Vol 28 (7) ◽  
pp. 861-880 ◽  
Author(s):  
Pedro Mocho ◽  
Rafael Royo-Torres ◽  
Elisabete Malafaia ◽  
Fernando Escaso ◽  
Bruno Silva ◽  
...  
Keyword(s):  
Upper Jurassic ◽  
Lusitanian Basin

scholarly journals Revision of Late Tithonian charophytes from Lisbon and Sintra-Cascais (Portugal): taxonomy, biostratigraphy and palaeobiogeographical significance

2010 ◽  
Vol 29 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Ricardo Pereira ◽  
Ana Cristina Azerêdo ◽  
Monique Feist
Keyword(s):  
Population Analysis ◽  
Population Variation ◽  
The South ◽  
Definition Of ◽  
Lusitanian Basin

Abstract. The re-evaluation of the charophyte content of ‘Purbeckian’ sediments from several sections around Lisbon (Olelas and Brouco) and Sintra-Cascais (Murches, Atrozela and Malveira-Guincho) revealed new palaeofloral associations from the Late Tithonian of the South Lusitanian Basin (Portugal). These sections contain Globator rectispirale, G. aff. nurrensis, Nodosoclavator bradleyi, Clavator reidi, Clypeator cf. discordis, Porochara maxima, and newly described occurrences of P. jaccardi, Mesochara harrisi and nodosoclavatoroide utricles. These revised data reinforce the evidence for assigning most of the studied deposits to a Late Tithonian age, instead of the formerly accepted wider interval Tithonian to Early Berriasian (‘Purbeckian’). Population analysis and statistics were applied in order to better assess population variation of the different species.The results of this study are relevant as they contribute to improve the biostratigraphical definition of the ‘Purbeckian’ formations of Portugal and allow more accurate palaeobiogeographical interpretations within the central Tethyan domain, by comparison of the identified charophyte assemblages with documented Jurassic–Cretaceous transition charophytes from other regions.

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