Biostratigraphie des bélemnites du Crétacé inférieur en France et en Bulgarie. Analyse comparative

Pages: 
pp. 31-39
Université Claude-Bernard- Lyon 1, Centre des Sciences de Ia Terre et Unité associée au C.N.R.S. no 11, 27-43 Boulevard du 11 Novembre, 69622 Villeurbanne Cedex (France)
Ecole supérieure des Mines et de Géologie, 1156 Sofia
Abstract: 

R. Combémorel, M. Stoyanova-Vergilova. Biostratigraphy of the Lower Cretaceous belemnites in France and Bulgaria. Comparative analysis. In Bulgaria the Lower Cretaceous belemnites become abundant as late as the beginning of the Hauterivian Stage. At the same time, the French belemnite faunas, still rare in the Berriasian, where a few species are to be found coming from the Tithonian, gradually become richer as the Valanginian develops. In the latter they are of a considerable stratigraphic significance. From the Hauterivian through the Aptian Stage the belemnites faunas in both countries grow quite varied, being much richer in Bulgaria. Through the Aptian Stage the belemnites decrease in variety, especially in France. The belemnites fauna diminishes much more gradually in Bulgaria, where a number of species from the European and Tethys provinces persist till the Cenomanian.

VOLUME 21 (1)/February 1991

Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

Institute of Regional Geology for Latin America (IGREPAL), National University of San Juan (UNSJ), Argentina
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Institute of Regional Geology for Latin America (IGREPAL), National University of San Juan (UNSJ), Argentina
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Institute of Regional Geology for Latin America (IGREPAL), National University of San Juan (UNSJ), Argentina
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Institute of Regional Geology for Latin America (IGREPAL), National University of San Juan (UNSJ), Argentina

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Université Claude-Bernard- Lyon 1, Centre des Sciences de Ia Terre et Unité associée au C.N.R.S. no 11, 27-43 Boulevard du 11 Novembre, 69622 Villeurbanne Cedex (France)
|
Ecole supérieure des Mines et de Géologie, 1156 Sofia

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
|
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
|
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
|
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria