The sedimentological characterization of the TST 1-4 suggests that progressive deepening from inner shelf swampy lagoonal facies (Amb 4) to proximal (Amb 1) and distal middle shelf facies (Amb 3B) dominates up section.
The RST 1 constitute Amb 5 facies of non marine nature while RST 2 shows distal middle shelf facies (Amb 3B) successively overlain by the Amb 3A (proximal middle shelf) and inner shelf lagoonal/swampy (Amb 4) facies.
The rocks exposed at the Ohesaare cliff mostly represent the open shelf facies
belt, but the upper part of the section, which formed during a considerable shallowing event (Hints et al.
Present-day Estonia is situated within the shelf facies belt and transitional zone (Livonian Tongue).
In the peripheral parts of the Palaeobaltic Basin (Taagepera, Tartu, Valga, and Voru drill cores) upper Ordovician dolostones occur in the shallow shelf facies, where they are cross-cutting neighbouring facies and depositional sequences or interbedding with limestones (Fig.
The inner shelf facies
have an enhanced porosity due to transformation of calcite to dolomite and micritization of skeletal fragments.
The Dzvenygorod Fm represents open shelf facies
conditions, as shown by the Dayia bohemica brachiopod, Calymene dnestroviana trilobite and Holacanthia socialis coral communities (all BA 3, the last one also BA 4).
1999, 2001, 2003) have shown that dolomitization associates with the regressive phases of the evolution of the Baltic Palaeobasin and is related to the restricted area of inner shelf facies
The material was collected from the carbonate rocks of reef and reef-related shelf facies
The presence of coquina interbeds indicates that deposition proceeded in the inner part of the open shelf facies
zone (IIIa) by H.
The missing link between the shoaly facies of the Jaagarahu Formation and the transitional marlstones of the Jamaja Formation, that is, contemporaneous deposits of the open shelf facies
zone, stayed unknown until 1988, when a borehole was drilled near Lake Riksu in western Saaremaa about halfway between Jaagarahu and Ohesaare (Fig.
Silurian (Llandovery, Wenlock), primarily normal-marine carbonate sediments of shoal and open shelf facies
have undergone intensive dolomitization.