Rogosa's composition and distribution in Silurian stratigraphical units of Volyn-Podilla

In the article complex approach to fossils study is emphasized. It is need for getting as possible exact Stratigraphical division of sequence and correlation of Silurian deposits of VolynoPodillia. The Schema of facial dynamic is shown. The environmental effect for changing Species diversity of Rugosans is discussed. The sequence is divided on three local series: Yaruga, Malinovtsy and Rukshin. The shallow water conditions were most favorable for Rugosa corals communities. Facies dependency of benthos limited it universality for stratigraphical arrangements.