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

• Autorzy: Gorog A. , Wernli R.
• Konferencja: International Congress on the Jurassic System (7 ; 06-18.09.2006 ; Kraków, Poland)
• Języki publikacji: EN

Abstrakty

EN

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).

Słowa kluczowe

EN

Protoglobigerinids; Oberhauserellidae; Conoglobigerinidae; Bajocian; Bathonian; Jura Mts.; France

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2006
• Tom: Vol. 4, no. 1
• Strony: 233--233
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Gorog A.

autor

Wernli R.

• Department of Palaeontology, Eotvos University, Pazmany Peter setany 1/C, Budapest, H-1117, Hungary,

Bibliografia

• Gorbachik T. N. 1986. Yurskie i rannemelovie planktonnie foraminiferi yuga SSSR. Jurassic and Early Cretaceous planktonic foraminifera from the South SSSR. 1-238. Akademia Nauk SSSR, Moskow.
• Görög Á. and Wernli R. 2002. The Middle and Late Bathonian protoglobigerinids of Gyenespuszta (Bakony Mts., Hungary). Revue de Paléobiologie, 20, 1: 12-23.
• Görög Á. and Wernli R. 2003. Palaeobiogeography of the Middle Jurassic protoglobigerinids (Foraminifera). Eclogae Geologicae Helvetiae, 96, 2: 28-36.
• Morozova V. G. and Moskalenko T. A. 1961. Foraminif-res planctoniques des dépôts limitrophes du Bajocien et du Bathonien du Dagestan central (NE du Caucase). Voprosy Micropaleontologii SSSR, 5: 3-30.
• Wernli R. and Görög Á. 1999. Protoglobigerinids (Foraminifera) acid extracted from Bajocian limestones (Hungary). Revista Espanola de Micropaleontologia, 31, 3: 419-426.
• Wernli R. and Görög Á. 2000. Determination of Bajocian protoglobigerinids (Foraminifera) in thin sections. Revue de Paléobiologie, 19, 2: 399-407.