FRASNIAN TABULATA AND RUGOSA CORALS FROM THE GRALIOVA QUARRY(VITEBSK REGION OF BELARUS, WESTERN PART OF THE MAIN DEVONIAN FIELD)

Abstract

The paper covers the taxonomic composition, living conditions and stratigraphic distribution of Tabulate and
Rugose corals in the Middle Frasnian (Upper Devonian) deposits exposed in the Graliova quarry. This locality is
confined to the Orsha Depression and to the western part of the Main Devonian Field (MDF). The following species are
reported: Mastopora compacta (Tchernуchev), Syringopora fragilis Sokolov, Scoliopora denticulata (Milne-Edwards et
Haime), Thamnopora cervicornis (Blainville), Thamnopora polyforata (Schlotheim), Аlveolites suborbicularis Lamarck
(Tabulata), Disphyllum paschiense (Soshkina) and Hexagonaria arctica (Meek) (Rugosa). Representatives of the tabulate
coral genera Scoliopora and Syringopora are not common in other parts of the MDF, whereas the genus Aulopora, which
is prevalent in most of the MDF, is absent in coral assemblages revealed in the Graliova quarry. Thus it can be concluded,
that the Middle Frasnian fauna of the Orsha Depression is not completely identical to the fauna of the MDF. This
specificity must be taken into account when correlating the Middle Frasnian strata within the Orsha Depression, as well
as between this region and the rest of the MDF.

Key words: Corals; Tabulata; Rugosa; Devonian; Middle Frasnian; Orsha Depression; Main Devonian Field.

Fig. 8. Ref.: 27 titles.