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The Callovian (Middle Jurassic) crinoids from the black clays of the Łuków area, eastern Poland

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Abstract:

The description of a high-diversity crinoid fauna [Chariocrinus andreae (Desor), Balanocrinus sp., B. berchteni Hess & Pugin, B. pentagonalis (Goldfuss), B. subteres (Münster in Goldfuss), Isocrinus sp., I. nicoleti (Desor), I. pendulus (V. Meyer), Pentacrinites cf. dargniesi, Paracomatulidae sp. et gen. indet., Palaeocomaster sp.] from the Middle Jurassic (Callovian) of eastern Poland (Łuków area) is presented. The list of all crinoid species found hitherto in the Middle – Upper Jurassic strata of extra-Carpathian Poland is also given. Almost all crinoids mentioned above immigrated into central and northern Europe from the Tethys from a southern direction during Middle – Late Jurassic times. They constitute a typical Mediterranean fauna. Similar to other Polish localities where clay deposits of the Bajocian – Bathonian and Valanginian ages are exposed and to the Callovian Łuków clays, isocrinids are the most numerous crinoid group, while the significance of millericrinids and comatulids is marginal. On the other hand cyrtocrinids are a dominant group in Oxfordian deep-water carbonates of extra-Carpathian Poland.
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