Multi-stage development of carbonate buildups has been recognised in the Bol'shaya Nadota Carbonate Complex, in
         the vicinity of the town of Inta (Subpolar Urals).  The growth of typical stromatoporoid-coral bioherms, characteristic
         of the Middle-Late Devonian stage, was terminated by the appearance of the shallow water oolitic facies, most proba-
         bly at the beginning of the Famennian.  During the Viséan stage the carbonate platform was reconstructed, but algal-
         brachiopod-coral bioherms were characterized by relatively small dimensions and an interfingering with organodetri-
         tal-oolitic facies.  Sporadically, the inter-mound facies is represented by goniatite-bivalve coquinas with two new goni-
         atite species: Goniatites olysya sp.nov. and Lusitanoceras kusinae sp.nov.
         The persistence of biohermal sedimentation in the Bol'shaya Nadota area is most probably caused by the specific posi-
         tion of the region on the boundary of two sedimentary-structural units: Lemva md Elets Zones, which corresponded to
         a basinal and a tectonically-active elevated part of a platform margin respectively.
         The overall biotic composition of the Carboniferous bioherms from Bol'shaya Nadota, situated in the northern periph-
         ery of Laurussia, falls generally within the diversity spectrum of Lower Cuboniferous mounds described from the
         southern margin of the continent.