Vol 6, (1977)

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Category: Vol 6, (1977)

• Barrandian
• Klabava Formation
• graptolites
• Ordovicin

Authors: Jaroslav Kraft

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 Abstract: The Klabava Formation (Arenigian) of the Bohemian Ordovician in the western part of the Barrandian Paleozoic basin is developed on a clayey shale facies. Its thicknesses are in places great, but it Is very poor in paleontologic material, except some horizons with relatively high fossil accumulations. Graptolites are the dominant faunal component In the Klabava Formation, and representatives of the other groups are rare. The graptolite fauna from the Klabava Formation was studied systematically by Bouček. The graptolites from the Lower Ordovician of Bohemia Bouček revised his previous studies of the Klabava Formation graptolites fauna and added new information obtained by studying a rich material from a number of boreholes drilled III the west Barrandian between the fifties and sixties. In addition to the localities reported by Bouček (1973) from the Rokycany area in the centre of the western part of the Barrandian, there are several outcrops of clayey shale of the Klabava Formation which have yet escaped palaeontologic attention. The systematic palaeontologic studies made by myself and my father on both these outcrops and Bouček's classical localities during the last years permitted us to obtain a rich graptolite material that gives a fairly comprehensive picture of the graptolite fauna In the Klabava Formation. This paper summarized the results gained by examining the material just mentioned. It is supplemented by a study of the fossil from the boreholes drilled in the Volduchy a Těžkov areas between 1970 and 1971. Also included are some remarkable graptolites recorded from the classical localities in the Klabava Formation from M. Mergl's private collection. The material dealt with in this paper is in the collection of the District Museum of Dr. B. Horáka, Rokycany.