Vertebrate macroremains as stratigraphic markers: the case of the Lower Devonian “Kujdanowiaspis assemblage” from Podolia (Ukraine) and Celtiberia (Spain)
2010 (English)Conference paper (Other academic)
The vertebrate fauna, including chondrichthyan microremains and osteostracan and placoderm macroremains encountered in the Lower Devonian (i.e. Lochkovian and Pragian) deposits from Podolia (Ukraine; see list in Voichyshyn, 2001) was considered as unique. Unfortunately, because of the Old Red Sandstone facies, the stratigraphic boundaries were very difficult to determine. Until recently, most of the units were lithologic. The occurrence of the arthrodire placoderm Kujdanowiaspis buczacziensis has since been proposed to mark the beginning of the Pragian, owing to a number of correlations between fossil distributions (i.e. the pteraspidiform Althaspis) in Western Europe and Podolia (Dupret and Blieck, 2009).
Recently, the long time “unique” placoderm and chondrichthyan faunal assemblage from Podolia has been found in Spain (Martinez-Pérez et al., in press; Dupret et al., submitted). The absence of K. buczacziensis, nevertheless, leads us to consider an age older than Pragian, i.e. late Lochkovian. This dating confirms previous works mainly based on invertebrates and conodonts. These “double check” processes confirm the possibility of using macrovertebrate remains for stratigraphic purposes.
The occurence of the same fauna during the Late Lochkovian in Podolia (southern margin of Laurussia) and in Spain (Armorican ”block”, part of northern margin of Gondwana or independant component), leads us to favour palaeogeographic reconstructions showing a proximity between both palaeo-provinces, allowing for the formation of, at least, punctual migratory paths. Moreover, the Old Red Sandstones have long been considered as non-marine deposits, especially in Podolia, despite the discovery of seldom brachiopod (lingulid) fragments. The similar faunal composition between Podolia and Celtiberia (the latter being clearly marine) challenges the non-marine status of the Podolian deposits.
Place, publisher, year, edition, pages
2010. 88-89 p.
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:uu:diva-141868OAI: oai:DiVA.org:uu-141868DiVA: diva2:386408
STRATI 2010, 4th French Congress on Stratigraphy, Université Pierre et Marie Curie - UPMC, Paris, August 30 – September 2, 2010