Cyclostome bryozoans from the Kimmeridgian (Upper Jurassic) of Poland

Few bryozoans have been described from Kimmeridgian deposits worldwide. A fauna of cyclostome bryozoans is described here for the fi rst time from two localities in the Lower Kimmeridgian of the Holy Cross Mountains of Poland. Containing eight species, all encrusting, it represents the most diverse Kimmeridgian bryozoan fauna yet discovered. Two of the species are new, Reptoclausa radwanskii n. sp. and Hyporosopora radomensis n. sp. Th e record of Reptoclausa helps to bridge the gap between Aalenian and Hauterivian occurrences of this genus.

Crinoid assemblages in the Polish Givetian and Frasnian

Givetian and Frasnian crinoid faunas of the Holy Cross Mts and Silesia-Cracow Region are arranged in fourteen assemblages. Their diversity decreases generally from northern to southern regions reflecting crinoid habitat differentiation during either platform or reef phases of facies development. Distributional patterns are superimposed on a six-step general succession of the faunas which was mainly controlled by environmental changes related to eustatic cycles. Nine crinoid species have been identified by calyces, thirteen species are based on stems attributed to calyx genera, and forty-eight kinds of colurnnals, probably representing distinct species, are classified within artificial supraspecific units. Of them thirteen are new: Anthinocrinus brevicostatus sp. n., Asperocrinus brevispinosus sp. n., Calleocrinus bicostatus sp. n., Calleocrinus kielcensis sp. n., Exaesiodiscus cornpositus sp. n., Kasachstanocrinus tenuis sp. n., Laudonornphalus pinguicostatus sp. n., Noctuicrinus? varius sp. n., Ricebocrinus parvus sp. n., Schyschcatocrinus delicatus sp, n., Schyschcatocrinus sltiformiss p. n., Stenocrinus raricostatus sp. n., and Urushicrinus perbellus sp. n.