(2) to establish the faunal development on the Uralian side of the Baltica Plate, yielding the faunal associations indicating possible biofacies conditions and the palaeogeographical connections via the Moscow Basin or elsewhere; (3) to compare the faunal development in the Baltica and South China plates, where the carbonate facies share similar features (Lindstrom et al.
In the Ordovician, long before this happened, the Uralian border was being subjected to extensional strain associated with volcanism.
A hiatus seems to exist underneath the Olandian sequence everywhere along the Uralian border of Baltica.
In sharp contrast, the Uralian border was open to the ocean, and tectonic and volcanic events contributed to a rich variation in the lithologies.
2011) of Baltoscandia by a genus Macropyge reported from the lower Tremadocian of the Uralian border (Antsygin 2001).
All together we listed 172 genera from the Oland Series in the Baltica Plate, 120 of which are known in the Baltoscandian side of Baltica and 103 in the Uralian side (Parnaste & Bergstrom in press).
The following early Tremadocian faunas are fairly rich along the Uralian side of the Baltica Plate.
The results of tectono-thermal development studies of the Baltica palaeobasin suggest that despite the relatively low tectonic activity of the basin since the Precambrian, the sedimentary complex has been significantly influenced by the Caledonian, Hercynian, and
Uralian orogeneses, leading to fault reactivation and low-temperature hydrothermal processes.
