Zonation by ammonites and foraminifers of the Vraconnian-Turonian interval: A comparison of the Boreal and Tethyan domains (NW Europe / Central Tunisia)

Abstract

Abstract:Since the end of the 19th century the interval comprising the uppermost Upper Albian, the Cenomamian, the Turonian and the basal Coniacian has been subdivided, first into ammonite zones, then, beginning in the middle of the 20th century, into zones of planktonic foraminifera. These two groups, one macrofossil, the other microfossil, are particularly effective for bio-chronostratigraphy thanks to their rapid rates of evolution. But differences in the faunal makeup between the Boreal domain (northwestern Europe) and the Tethyan domain (Mediterranean) have for a long time hindered precise correlation of the two domains. Today, in a time interval covering about 16 million years, there are 29 ammonite zones in the Tethyan domain versus 24 in the Boreal one, of which 16 are common to both domains. For the planktonic foraminifera the Tethyan domain has 11 zones, the Boreal domain 10, with 7 in common.Key Words: Cretaceous; Albian; Vraconnian; Cenomanian; Turonian; ammonites; foraminifers; zones; zonation; Tethys.

Cenomanian and lower Turonian relative chronology and palaeoenvironmental framework of the Nouader site (Aures Basin, Northeastern Algeria)

“…. Lithostratigraphic setting with the encountered formations in the region and their corresponding biostratigraphic markers modified from Burollet (1956) and Amédro & Robaszynski (2008).…”

“…3). These lithological subdivisions were redefined by Fournié (1978), and although old, they continue to be commonly used by authors working in the region (Robaszynski et al 1993(Robaszynski et al , 1994(Robaszynski et al , 2008(Robaszynski et al , 2010Caron et al 2006;Amédro & Robaszynski, 2008;Chikhi-Aouimeur, 2010;K Chaabane, unpub. thesis, Univ.…”

“…These studies were followed by Amédro (1986) and Amédro & Robaszynski (1999) for some French sections, and, later, Kaplan et al (1998) and Wilmsen (2007), dealing with sequences in Germany. More recently, the scheme was revised by Amédro & Robaszynski (2008).…”

“…The boundaries between stratigraphic subdivisions of Cenomanian sub-stages were determined using the stratigraphic range of 56 ammonites collected from the local Cenomanian succession and its transition to the Turonian, and calibrated with some index foraminifera (if present). The used biozonations are those of Caron (1985), and, more recently, Amédro & Robaszynski (2008), who proposed an integrated correlation of ammonite and foraminifera zones between the Tethyan (Central Tunisia) and the Boreal (Western Europe) domains. The listed species are named in accordance with the enacted rules in the International Code of Zoological Nomenclature (CINZ).…”

Amonoideos Y Otros Macrofósiles Del Lectoestratotipo De La Formación La Frontera, Turoniano Inferior - Medio (Cretácico Superior) en San Francisco, Cundinamarca (Colombia)

“…Para Kennedy and Wright (1979), K. turoniense indica el Turoniano medio inferior en sectores bien datados con bioestratigrafía. Barroso-Barcenilla (2004) la ubica en la parte baja del Turoniano medio y Amédro and Robaszynski (2008) en el Turoniano medio.…”