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Protoglobigerinids and Oberhauserellidae (Foraminifera) of the Bajocian-Bathonian from the Southern Jura Mts., France

Gorog A., Wernli R.

Volumina Jurassica

2006

Vol. 4, no. 1

233-233

The Jurassic protoglobigerinids and other Globigerina-like foraminifera with aragonitic wall are generally considered as the ancestors of the Cretaceous planktonic foraminifera. They have been known for a long time as isolated specimens or in rock thin-sections, but they still raise several morphological and taxonomic problems. A detailed inventory of the Bajocian-Bathonian protoglobigerinids and other globigerina-like Foraminifera from the several localities of Southern Jura Mountains reveals a moderate abundance (>20%) of the Foraminifera fauna - and an unsuspected diversity, with 7 species of Conoglobigerinidae and 2 species of Oberhauserellidae. The discovery of two umbilical apertures in Oberhauserella as well as in some Conoglobigerina questions the generic taxonomy and makes the comparison with literature difficult. For these reasons, five new species have been proposed: Oberhauserella parocula and O.(?) aff. parocula (with 2 apertures), "Conoglobigerina" trilocula and "C". biapertura (with 2 apertures), C. solaperta and C. pupa. We demonstrate that Globuligerina balakhmatovae (Morozova 1961) (here emended) has a small globuligerine aperture as well as G. aff. dagestanica (Morozova 1961). Despite the different taxonomic concepts the Southern Jura Mountains associations, that are typical of the epicontinental platform, resemble the best those of the Dagestan and of the NW Caucasus (Morozova & Moskalenko 1961; Gorbachik 1986). They strongly differ from those of the oceanic Tethys, which are also very diverse (Gorog & Wernli 2002, 2003; Wernli & Gorog 1999, 2000).