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Université de Fribourg

First fossil frog from Antarctica: implications for Eocene high latitude climate conditions and Gondwanan cosmopolitanism of Australobatrachia

Mörs, Thomas ; Reguero, Marcelo ; Vasilyan, Davit

In: Scientific Reports, 2020, vol. 10, p. 5051

Cenozoic ectothermic continental tetrapods (amphibians and reptiles) have not been documented previously from Antarctica, in contrast to all other continents. Here we report a fossil ilium and an ornamented skull bone that can be attributed to the Recent, South American, anuran family Calyptocephalellidae or helmeted frogs, representing the first modern amphibian found in Antarctica. The two bone...

Université de Fribourg

La Formation du Grand Essert (Jura franco-suisse; Valanginien supérieur p.p. à Hauterivien supérieur basal) = The Grand Essert Formation (French-Swiss Jura Mountains; late Valanginian p.p. to earliest late Hauterivian)

Strasser, André ; Clavel, Bernard ; Monteil, Eric ; Charollais, Jean ; Piuz, André ; Mastransgelo, Bruno

In: Archives des Sciences, 2018, vol. 70, p. 205-282

Le terme de Formation du Grand Essert a été proposé en 2016 pour remplacer ceux de « Marnes d’Hauterive » auct. et « Pierre jaune de Neuchâtel » auct. attribués à l’« Hauterivien » auct. dans le Jura franco-suisse. L’objet de cette note est, dans un premier temps, de décrire et d’interpréter la lithologie de la coupe-type représentative de cette nouvelle formation,...

Université de Fribourg

Antarctica eye study: a prospective study of the effects of overwintering on ocular parameters and visual function

Stahl, Matthew H. ; Kumar, Alexander ; Lambert, Robert ; Stroud, Michael ; Macleod, David ; Bastawrous, Andrew ; Peto, Tunde ; Burton, Matthew J.

In: BMC Ophthalmology, 2018, vol. 18, no. 1, p. 149

In 2013 five polar explorers attempted to complete the first Trans-Antarctic Winter Traverse (TAWT). This study presents the ophthalmological findings for this group, who overwintered in Antarctica as part of the White Mars Human Science Protocol. Antarctic crews are exposed to extreme cold, chronic hypoxia and altered day-night cycles. Previous studies of Antarctic explorers have focused on...

Université de Fribourg

The early to middle triassic continental–marine transition of NW Bulgaria: sedimentology, palynology and sequence stratigraphy

Ajdanlijsky, George ; Götz, Annette E. ; Strasser, André

In: Geologica Carpathica, 2018, vol. 69, no. 2, p. 129–148

Sedimentary facies and cycles of the Triassic continental–marine transition of NW Bulgaria are documented in detail from reference sections along the Iskar river gorge between the villages of Tserovo and Opletnya. The depositional environments evolved from anastomosing and meandering river systems in the Petrohan Terrigenous Group to mixed fluvial and tidal settings in the Svidol Formation,...