The article considers the stages of tabulata community development in the Devonian sediments of the south-eastern part of Gorny Altai. The authors allocated three sites of extinct coral subclass complexes with different species diversity. The greatest species diversity is characteristic for the end of the Early Devonian. Complex (I) contains 19 species belonging to six genera - Thamnopora lecomtei Dubat., Th. alta Tchern., Th. beliakovi Dubat., Th. compacta Tchud., Th. Polytermata Dubat., Th. Parva Yanet., Th. proba Dubat., Th. siavis Dubat., Th. pulchra Tchern., Pachyfavosites vilvaensis Sok., P. exites Sok., P. markovskyi Sok., P. polymorphus (Goldf.), P. vilvaensis Sok,. Alveolites cf. strigosus Dubat., A. levis Tchern., Coenites sp., Siringopora dubia Sok., Thecostegites cf infundibuliferus Tchern. Complexes (I) of the Late Emsian tabulata were studied at four sites - Eshtykol Tract (right side of the Lower Karasu Valley), the left bank of the Karakabak Creek (northern part of the North Chui Ridge - left bank of the Mashey River), the right bank of the Aktru River (Tomsk State University Meteorological Station area), and the Daya River (left side of the ChaganUzun River). In the first three sites the samples were collected from the sediments of the Baragash (Mashey) suite. The fourth site belongs to the stratotype of the Dayan suite. The second complex (II) of tabulata communities belongs to the deposits of the Givetian Age of the Middle Devonian is presented by 11 species belonging to seven genera - Thamnopora proba acrospina Dubat., Th. karmakensis Tchern., Th. cf. certa Tchern., Th. sp., Tyrganolit eseugeni Tchern., Thecostegites infundibuliferus Tchern., Pachyfavosites polymorphus(Goldf.), Coenites fascicularis (Radug.), Emmonsia sp., Rhachopora sp. These corals were collected from the area of the Ular Tract (right side of the Chui Valley, above the mouth of the Belgebash River, the stratotypical region of the Belgebash suite distribution) and the Boshtu Tract (near the village Kokorya, the Belgebash suite section). The third complex (III) of tabulata was received from the deposits of the Upper Frasnian (Upper Devonian) and includes the following four types belonging to four genera - Syringopora fragilis Sok., Thecostegites rossicus Sok., Pachyfavosites squamatus Dubat., Cladopora vermicularis Mc Coy. The third complex (III) is obtained from coral tabulates of the Upper Frasnian (Upper Devonian) in the three points of the south- eastern Gorny Altai - the western shore of Lake Cheybekkel, left side of the Daya River on the left bank of the Chagan-Uzun River the Kyzyl-Shin River gorge. All samples are taken from the limestones of the Tueryk suite. Outside the carbonate bodies coral finds are unknown. The results can be used to determine the relative geological age of the sedimentary formations of the marine genesis.
