Integrated stratigraphy, conodont turnover and palaeoenvironments of the upper Wenlock and Ludlow in the shallow marine succession of the Vilkaviškis-134 core (Lithuania)
Radzevičius, Sigitas; Spiridonov, Andrej; Brazauskas, Antanas; Dankina, Darja; Rimkus, Algirdas; Bičkauskas, Giedrius; Kaminskas, Donatas; Meidla, Tõnu; Ainsaar, Leho
Newsletters on Stratigraphy Volume 49 Number 2 (2016), p. 321 - 336
published: Apr 1, 2016
ArtNo. ESP026004902001, Price: 29.00 €
New data on the Upper Homerian and Ludlow (Silurian) stratigraphy of the shallow water sedimentary and biotic succession of the Lithuanian part of the Silurian Baltic basin are presented here based on detailed analysis of the Vilkaviškis-134 core. Four formations: the Riga, Gėluva and Širvinta formations of Wenlock age and the Neris Formation of Ludlow age were distinguished on the basis of detailed examination of polished rock slabs and natural gamma logs. According to the distribution of stratigraphically restricted conodonts and graptolites, as well as δ13 C variations, four regional stages were established: the Jaagarahu, Gėluva, Dubysa and Pagėgiai. A heuristic "delay phase" evolutionary-palaeobiogeographic model for a global turnover pulse is proposed. The model is based on analysis of the temporal distribution of the conodont species. Palaeotemperatures and climate regimes were determined using δ18 O and Al/Ti oxide ratio data.