New Rugose corals and refinements of the Tournaisian biostratigraphy of the Donets Basin (Ukraine)

Abstract

ABSTRACT. Specimens collected by Vassilyuk from the lower part of the Tournaisian strata of the southern Donets Basin and described as Campophyllum caninoides Sibly are re-examined. These specimens re-attributed to the Conilophyllum priscum (Münster, 1840), which is a well-known species in the lower part of the Lower Tournaisian of Western and Eastern Europe, Kazakhstan, North America and China (Junggar). Corphalia simplex (Perna, 1923) is for the first time identified at the top of Tournaisian in the Donets Basin. This species was described at similar stratigraphic levels on the eastern slope of the Southern Urals and in Belgium. The application of described species for interregional correlation of the Tournaisian subdivisions is discussed herein. Evolutionary relations between Corphalia and Dorlodotia near the Tournasian-Viséan boundary have been confirmed indirectly.

Acta Geologica Polonica

“…The junior author examined most of the outcrops bearing the Mandrykinian Regional Stage deposits, including the stratotype, and determined Limestone F 1 to be the thickest (2.0-12 m) and most stable limestone of the group (Ogar 2012). It is composed of blue-grey algal massive limestones with rare macrofauna.…”

“…It is overlain by a 1.5-2 m thick layer of dark-grey to black wackestone containing rhodoliths (red algal nodules), crinoid fragments, brachiopods, bivalves, and small solitary rugose corals. The complex composition of the Limestone F 1 in this outcrop allowed the junior author to distinguish its lower part as an algal bioherm (Ogar 2012), 200×600 m in size with a maximum thickness of 15 m.…”

Acta Geologica Polonica

“…Limestone intercalations vary in number and thickness. Most of them are thin, at 0.1-0.65 m. However, Ogar (2012) characterised the thickness of Limestone F 1 as varying from 12 m in the type section along Krynka River near Donetsk and along Luhanchik River near Luhansk, but often reduced to only 2 m or less in other areas. The large thickness of Limestone F 1 in the northern part of the basin was due to the development of a large bioherm (Ogar 2012), yielding diverse kumpanophyllid rugose corals (Fedorowski and Ohar 2019).…”