O głowonogach z warstw górażdżańskich (dolny wapień muszlowy) w kamieniołomie "Górażdże" k. Opola

Ryszard Podstolski

Abstract


ON CEPHALOPODS FROM THE GÓRAŻDŻE BEDS (LOWER MUSCHELKALK) QUARRIED AT GÓRAŻDŻE NEAR OPOLE

Summary
Imprints of cephalopod shells were found in Triassic limestones quarried at Górażdże near Opole. Cephalopod were previously reported from these strata by P. Assmann but the whole collection gathered by him has been taken to Berlin. After the world war II, cephalopod macrofauna of these rocks was rather out of scope of the studies and the fossils described here are the first reported from this region after the break in the studies. They include imprints of specimen with damaged nucleus and a fragment of outer whorl of the other. Latex casts made it possible to assign the former to Pleuronautiius planki Assmann and the latter - to Ceratites cf. aorasdzensis Assmann.
Pleuronautilus planki A1ssmann. The cast of specimen about 43 mm in size (with outer whorl 16 mm high and about 20 mm wide), discoidal in shape, with evolute coiling, and not displaying nucleus nor body chamber. Whorls weakly overlapping one another and slowly increasing in size. Whorls trapezoidal in cross-section, with fiat sides and slightly convex venter. Ribs wide, well-marked, connecting nodes developed at umbilical and ventral margin. Keel is missing and the venter is smooth.
Ceratites cf. gorasdzensis Assmann. The cast of external part of outer whorl of the specimen display several features making possible its assignation to this species with reservation. The features include: typical ribbing including primary ribs dividing into two secondaries in the mid-height, and secondary ribs ending at characteristic nodes at the ventral margin.
The specimens were found in top part of the first zone of the Górażdże Beds.

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