Reference : 2009-2010 Russo-franco-latvian expeditions in the Main Devonian Field (North-western ...
Scientific congresses and symposiums : Paper published in a book
Life sciences : Zoology
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
2009-2010 Russo-franco-latvian expeditions in the Main Devonian Field (North-western Russia)
Olive, Sébastien mailto [Université de Liège - ULg > > > Doct. sc. (géologie - Bologne)]
Lebedev, Oleg [Borissiak Palaeontological Institute of the Russian Academy of Sciences > > > >]
Ivanov, Alexander [St.Petersburg University > Paleontology > > >]
Clément, Gaël [Muséum National d'Histoire Naturelle (Paris, France) > UMR 7207 > > >]
Lukševičs, Ervins [University of Latvia > > > >]
Blieck, Alain [University of Science and Technology of Lille > > > >]
Zakharenko, Galina [Borissiak Palaeontological Institute of the Russian Academy of Sciences > > > >]
Zupiņš, Ivars [Natural History Museum of Latvia > > > >]
Sturis, Valdemars [University of Latvia > > > >]
Palaeozoic Early Vertebrates II - Obruchev Symposium - Abstracts
Lebedev, Oleg
Ivanov, Alexander
II International Obruchev Symposium Palaeozoic Early Vertebrates
From 01-08-2011 to 06-08-2011
Saint Petersburg State University
Borissiak Palaeontological Institute of the Russian Academy of Sciences
Russian Foudation for Basic Research
Centre National de la Recherche Scientifique
Saint Petersburg
[en] In the frame of an international project between the Paleontological Institute of Moscow and the Museum of Paris, a Russo-Franco-Latvian team has been set up to prospect the Main Devonian Field in North-Western Russia (Novgorod and Leningrad Regions). This joined project started in 2009 (one month of field trip), continued in 2010 (one month also) and will end in 2011. The two first years were mainly devoted to the prospecting of historical localities, some discovered and/or exploited by Dmitry Obruchev himself. Such a method is effective but quite time-consuming; i.e. to rediscover the accurate location of the localities by discussing with denizens, to fathom the archives out and to access to non-weathered layers by removing the altered surface.
Novgorod and Leningrad Regions are topographically excessively flat. Devonian fields have not been disrupted by tectonic movements and the layers are thus horizontal. Rocks are most often quite unconsolidated (consisting of loose sands or clays) and excavations are thus relatively easy. The lack of relief and the vegetal cover unfortunately lead to few outcrops in the landscape. They are all located along rivers (Lovat’, Syas' and Oredesh rivers for instance) or are represented by outliers. Although most of the localities were easily accessible by cars, others required several kilometers by feet and/or by boat. Roughly 30 localities have been prospected. About one third of them are very interesting such as Borshovo and Goryn' (Luga District) which provided numerous and exquisite fossils of placoderms, agnathans and sarcopterygians. The original locality of the Frasnian tetrapod Obruchevichthys in Russia, Sondala (Leningrad Region), has been rediscovered with near certainty.
Origin, ecology and environments of the earliest tetrapods from the Upper Devonian (Frasnian) and paleogeography in the Eastern "Old Red Sandstone Continent".
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