Papers by Francis Robaszynski
Terminal Cretaceous ammonite evolution and extinction in the Tunisian Basin
status: …, 2005
KULeuven. ...
Campanian to Maastrichtian ammonite faunas from Tunisia
Scientific Program …, 2005
KULeuven. ...
Nostoceras (Bostrychoceras) polyplocum ROEMER in Tunisia
status: …, 2004
KULeuven. ...
Cg2007_M02_Abstract01, 2007
Relations entre les marges septentrionale et méridionale de la Téthys au Crétacé [Relations betwe... more Relations entre les marges septentrionale et méridionale de la Téthys au Crétacé [Relations between the northern and southern margins of the Tethys ocean during the Cretaceous period].
Zonation by ammonites and foraminifers of the Vraconnian-Turonian interval: A comparison of the B... more Zonation by ammonites and foraminifers of the Vraconnian-Turonian interval: A comparison of the Boreal and Tethyan domains (NW Europe / Central Tunisia).- 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,
Cretaceous Resources, Events and Rhythms, 1990
The Campanian to Lower Maastrichtian Abiod Formation of the Ellè s section, central Tunisia, has ... more The Campanian to Lower Maastrichtian Abiod Formation of the Ellè s section, central Tunisia, has been analyzed bed by bed for cyclostratigraphic purpose. Based on the ''20 kyr'' precession and ''100 kyr'' eccentricity cycles, sedimentation rate profiles were generated, which were then transformed into cumulative time scales. The resulting synthetic time scale places identified sedimentary and biological events in a new time-based framework floating around the Campanian-Maastrichtian boundary. This new time scale was compared with previously published geological time scales.
The cretaceous of the boulonnais (France) and a comparison with the cretaceous of Kent (United Kingdom)
A high-resolution stratigraphy has been developed for the interval encompassing the Cenomanian-Tu... more A high-resolution stratigraphy has been developed for the interval encompassing the Cenomanian-Turonian boundary (CTBI), by means of several lithological, biological and geochemical events. This work entails the study of two sections selected on the base of the completeness of their sedimentary record and their contrasting paleogeographical setting: (1) The Rock Canyon Anticline section west of Pueblo, Colorado, (US Western Interior
Cretaceous Research, 2010
In central Tunisia, the thickness of the Bahloul Formation varies generally between 20 to 40m suc... more In central Tunisia, the thickness of the Bahloul Formation varies generally between 20 to 40m such as for example, respectively, at wadi Smara near Kalaat Senan and at wadi Bahloul near Maktar. The thickness is also of several tens metres at Koudiat el Azreg near Jerissa and at Tajerouine. In these sites where the thickness of the Bahloul Formation is
The Albian (Vraconnian)Cenomanian boundary at the western Tethyan margins (Central Tunisia and southeastern France)
Bulletin De La Societe Geologique De France, 2008
Geobios, 2005
The vertical distribution of Albian ammonites of the North Pacific Province is described on the b... more The vertical distribution of Albian ammonites of the North Pacific Province is described on the basis of several sections located in Northern California. Nine Albian ammonite assemblages are identified, compared to the 4 previously described by Murphy in 1956. Owing to several gaps of observation possibly more assemblages could exist. In the North California Albian history, the first results show
Geobios, 2006
A high-resolution stratigraphy has been developed for the interval encompassing the Cenomanian–Tu... more A high-resolution stratigraphy has been developed for the interval encompassing the Cenomanian–Turonian boundary (CTBI), by means of several lithological, biological and geochemical events. This work entails the study of two sections selected on the base of the completeness of their sedimentary record and their contrasting paleogeographical setting: (1) The Rock Canyon Anticline section west of Pueblo, Colorado, (US Western Interior
THE ROTALIPORIDS, A POLYPHYLETIC GROUP OF ALBIAN-CENOMANIAN PLANKTONIC FORAMINIFERA: EMENDATION OF GENERA
The Journal of Foraminiferal Research, 2007
The rotaliporids are a group of mid-Cretaceous planktonic foraminifera that have gained increasin... more The rotaliporids are a group of mid-Cretaceous planktonic foraminifera that have gained increasing stratigraphic importance in the last few decades. Six genera are presently described: Rotalipora, Thalmanninella, Anaticinella, Pseudoticinella, ...
Événements à l'échelle globale pendant la partie moyenne du Crétacé
Geobios, 1989
Données minéralogiques, géochimiques et biologiques comparéesdans les craies cénomaniennes à santoniennes du Boulonnais
Geobios, 1989
Geobios, 2007
The foraminiferal content of two stratigraphic sections, located in eastern Iran within the Sahla... more The foraminiferal content of two stratigraphic sections, located in eastern Iran within the Sahlabad province, between the Lut and Afghan blocks and ranging in age from Turonian to Campanian is investigated. Previous studies were general and only indicated the presence of planktonic foraminifera in this province. This paper presents a detailed study of planktonic foraminifera of the Shirshotor unit and establishes for the first time a local biostratigraphy consisting of five biozones. Biozones from the upper Turonian to lower Campanian are recognized, but the upper lower Campanian to lower upper Campanian strata are missing, as demonstrated by the lack of the Globotruncana ventricosa biozone. Tectonic activity in this region during the late early Campanian and mid-Campanian resulted in the presence of an unconformity together with debrites (debris flow deposits) in the lower upper Campanian. About twenty-five planktonic foraminiferal species are reported and illustrated. The largest faunal diversity is encountered in the upper Santonian. The planktonic foraminiferal biozones are precisely defined in selected stratigraphic sections and allow age determinations for the deepest marine sediments (pelagic limestones and bedded cherts) before the collision of the Lut and Afghan blocks. # 2007 Published by Elsevier Masson SAS.
Cretaceous Research, 1993
Cretaceous Research, 2005
The Provins boreholes (Poigny: Craie 701, and Sainte-Colombe: Craie 702) drilled in 1999 as part ... more The Provins boreholes (Poigny: Craie 701, and Sainte-Colombe: Craie 702) drilled in 1999 as part of the ''Craie 700'' project initiated by the Paris Basin Geologists' Association provide reference sections for the Upper Cretaceous of the eastern part of the Paris Basin. The lithology of the Cretaceous drilled at Poigny and Sainte-Colombe is presented in two logs displaying major lithoevents that provide lines of correlation. Bio-events are expressed by the appearance/disappearance of index species of fossils. Foraminifera give a biozonation close to that defined by previous work on the Anglo-Paris Basin. Some of these bio-events provide a second set of lines useful for correlation. From the results of these lithobiostratigraphic studies, stage boundaries from the Upper Albian to the Campanian have been located with a maximum uncertainty of a few metres.
Cretaceous Research, 1993
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Papers by Francis Robaszynski