For the Silurian, four reef-complexes were investigated. They are situated as lens bodies within crinoid limestones. The lenses are 150-250 cm long and 80-150 cm tall. The composition of fossils is repeated in each lens: Stromatoporoidea, Tabulatoidea, Favositida, Thamnoporida, Bryozoa, Crinoidea, Algae, rare Heliolitoidea, solitary Rugosa and Brachiopoda. The dominate taxa are Stromatoporoidea and Tabulatoidea (Favositida) with a variety of colonies: laminar, hemispheric, spheric, massive. The dimensions of the colonies varied from 2-3 to 20-30 cm across. The laminar and incrusting colonies dominated the periphery of the reef-complexes; the hemispheric, spheric and columnar dominated the central parts, where the colonies were large in size.
