Université de Fribourg

Bryozoan beds in northern Italy as a shallow-water expression of environmental changes during the Oligocene isotope event 1

Jaramillo-Vogel, David ; Bover-Arnal, Telm ; Strasser, André

In: Sedimentary Geology, 2016, vol. 331, p. 148–161

Shifts in carbonate-producing biotic communities in the geological record provide evidence of past environmental changes in the neritic realm. The shallow-marine Calcare di Nago Formation exposed in the San Valentino section (northern Italy) covers the Late Eocene and Earliest Oligocene. The succession is characterized by the occurrence of light-dependent biota such as coralline algae and larger...

Université de Fribourg

The Upper Aptian to Lower Albian syn-rift carbonate succession of the southern Maestrat Basin (Spain): Facies architecture and fault-controlled stratabound dolostones

Martín-Martín, J.D. ; Gomez-Rivas, E. ; Bover-Arnal, Telm ; Travé, A. ; Salas, R. ; Moreno-Bedmar, J.A. ; Tomás, Sara ; Corbella, M. ; Teixell, A. ; Vergés, J. ; Stafford, S.L.

In: Cretaceous Research, 2013, vol. 41, p. 217-236

Syn-rift shallow-marine carbonates of Late Aptian to Early Albian age in the southern Maestrat Basin (E Spain) register the thickest Aptian sedimentary record of the basin, and one of the most complete carbonate successions of this age reported in the northern Tethyan margin. The host limestones (Benassal Formation) are partially replaced by dolostones providing a new case study of...

Université de Fribourg

Clypeina helvetica Morellet and Morellet, 1918, revisited. A Priabonian (Late Eocene) dasycladalean alga from the Diablerets Nappe of the Helvetic Alps, southwestern Switzerland

Schlagintweit, Felix ; Bover-Arnal, Telm ; Menkveld-Gfeller, Ursula ; Strasser, André

In: Facies, 2013, vol. 58, no. 1, p. 287-297

The dasycladale Clypeina helvetica was described and illustrated with six drawings by Morellet and Morellet (Bull Soc Géol Fr 4o ser 18:102–105, 1918) from the “Bartonian” of the Helvetic Zone of southwestern Switzerland. Since then, C. helvetica has not been reported again neither from Switzerland nor from any other locality. Abundant material sampled from the Priabonian Diablerets Member...

Université de Fribourg

Lower Aptian ammonite and carbon isotope stratigraphy in the eastern Prebetic Domain (Betic Cordillera, southeastern Spain)

Moreno-Bedmar, J. A. ; Company, M. ; Sandoval, J. ; Tavera, J. M. ; Bover-Arnal, Telm ; Salas, R. ; Delanoy, G. ; Maurrasse, F. J.-M. R. ; Martínez, R.

In: Geologica Acta, 2012, vol. 10, no. 4, p. 333-354

Major global palaeobiologic and palaeoenvironmental changes occurred during the Early Aptian. Precise dating and timing of the different events is crucial to determine possible cause-effect relationships between them. In this regard, the combination of biostratigraphic and chemostratigraphic data can provide a very useful tool for time control. So far attempts to correlate the Lower Aptian carbon...

Université de Fribourg

Remarks on Bačinella Radoičić, 1959 (type species B. irregularis) and its representatives

Schlagintweit, Felix ; Bover-Arnal, Telm

In: Facies - International Journal of Paleontology, Sedimentology and Geology, 2012, p. -

Bačinella irregularis was described by Radoičić (Bull Serv Géol Géophys Rep Serbie 17:87–92, 1959) as an alga incertae sedis. Based on material from the Lower Aptian of the western Maestrat Basin (Spain), the genus Bačinella with its various species is revised; an emended diagnosis is given as well as a detailed description. Bačinella is interpreted as an organism that excavated complex...

Université de Fribourg

Uppermost lower aptian transgressive records in mexico and spain: chronostratigraphic implications for the Tethyan sequences

Moreno-Bedmar, Josep A. ; Bover-Arnal, Telm ; Barragán, Ricardo ; Salas, Ramon

In: Terra Nova, 2012, vol. 24, no. 4, p. 333–338

A widespread marine transgression, which began at the very end of the Early Aptian, is well recorded in Mexico and Spain. In Mexico, this transgression was the most important Aptian transgressive event and its record begins in the Dufrenoyia justinae Zone, whereas in Spain the corresponding transgression is registered in the uppermost part of the Dufrenoyia furcata Zone. The basal age of this...

Université de Fribourg

Corals on the slope (Aptian, Maestrat Basin, Spain)

Bover-Arnal, Telm ; Löser, Hannes ; Moreno-Bedmar, Josep Anton ; Salas, Ramon ; Strasser, André

In: Cretaceous Research, 2012, p. -

The term “reef” has been frequently misused when applied to fossil coral communities. Our popular but biased view of coral community structure based on the idyllic picture of recent tropical reefs has failed to recognize that, in many fossil examples, alternative states of community structure with no or limited framework may occur. The Aptian colonial scleractinians analysed in the western...

Université de Fribourg

Late Eocene transgressive sedimentation in the western Swiss Alps: Records of autochthonous and quasi-autochthonous biofacies on a karstic rocky shore

Bover-Arnal, Telm ; Jaramillo-Vogel, David ; Showani, Aso ; Strasser, André

In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2011, vol. 312, no. 1-2, p. 24-39

Carbonate karst unconformities represent primary sequence-stratigraphic boundaries but, where sealed by marine sedimentary successions, also signify ancient rocky shores. During the Late Eocene (Priabonian), a shallow sea flooded the deeply karstified and brecciated Cretaceous carbonate bedrocks of the western Swiss Alps. Transgression resulted in the formation of a rocky archipelago of basement...

Université de Fribourg

The morphological adaptation of Lithocodium aggregatum Elliott (calcareous green alga) to cryptic microhabitats (Lower Aptian, Spain): an example of phenotypic plasticity

Schlagintweit, Felix ; Bover-Arnal, Telm

In: Facies : International Journal of Paleontology, Sedimentology and Geology, 2011, p. -

Lithocodium aggregatum Elliott is interpreted as a heterotrichale chlorophycean alga with a prostrate and erect system within a well-calcified tissue. Within Lower Aptian coral rubble of the western Maestrat Basin, Spain, it forms thick masses of juxtaposed crusts around the bioclasts. In achieving a rapid and complete encrustation of the available bioclasts, Lithocodium applied several...