Inoceramus salisburgenis z warstw inoceramowych w rejonie Rybotycz

Abstract

Inoceramus salisburgenis from the Inoceramian Beds near Rybotycze (Polish East Carpathians) Three specimens of Inoceramus salisburgensis Fugger et Kastner have been found in the Inoceramian beds in the area between Rybotycze and Huwniki. Two specimens of that taxon have been collected from a small autcrop in the Sopotnik creek, a tributary stream of the Wiar, where the lower part of the upper Inoceramian beds is exposed. The third has been found in a complex of fucoid (siliceous auctorum) marls which occur in the eastern part of an outcrop on the Wiar river, described in an earlier publication (Kotlarczyk, Mitura 1968). A comprehensive analysis and systematization of the group of Inoceramus belonging to the sutogenera Trochoceramus and Platyceramus made by Seitz (1970) allows for a revision of the earlier determinations of the Carpathian Inoceramus. In the first place, specimens found in the western part of the outcrop on the Wiar and classified as In. boehmi Heinz (Kotlarczyk, Mitura 1968) are to be assigned to In. salisburgensis F. et K. The fragments of shells classified as In. boehmi Heinz (Mitura 1963, Pl. II, fig. 1) and In. haueri Zugmayer (Mitura 1963, Pl. I, fig. 5; Pl. IV, fig. 1) and also as In. cf. boehmi Heinz (Mitura 1963, Pl. II, figs. 2, 3a, 6) are to be regarded as belonging to In. (PI.) salisburgensis F. et K. or, in the latter case, to In. (Pl.) cf. salisburgensis F. et K. On the other hand, the forms determined as In. salisburgensis F. et K. (Mitura 1963, Pl. I, fig. 2) and In. cf. salisburgensis F. et K. (Mitura 1963, Pl. I, fig. lb) should be assigned respectively to In. (Troehoceramus) monticuli Fugger et Kastner and In. (Tr.) cf. monticuli F. et K. The above revision does not affect the stratigraphie conclusions since all the determined taxons have the same age range: Upper Campanian — Lower Maestrichtian. Taking into account all the localities with In. salisburgensis F. et K., the earlier finds included (Wiśniowski 1898; Niedźwiedzki 1901; Horwitz 1935; Krajewski, Urbaniak 1964), thirteen specimens of that species have been found so far in the Przemyśl-Dobromil Carpathians. Due to the known geological position of eight of them, it is possible to document with confidence the Late Cretaceous age of the greater part of the profile of the Inoceramian beds occurring in the marginal part of the Carpathians.