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Storm origin of bone-bearing beds in the Lower Devonian placoderm sandstone from Podłazie Hill (Holy Cross Mountains, central Poland)

Szrek P., Niedźwiedzki G., Dec M.

Geological Quarterly

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2014

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Vol. 58, No. 4

795–-806

EN

The placoderm sandstone (Emsian, Holy Cross Mountains) exposed in the abandoned quarry at Podłazie Hill was revisited and excavated during fieldwork conducted in 2011-2013. Bone-bearing breccias were identified for the first time at this site and subjected to taphonomic analysis. Vertebrate remains are dominated by heterostracans, while true placoderms compose less than 20% of the total vertebrate assemblage. The high degree of fragmentation of the bones and low degree of abrasion indicate that the remains were reworked and transported before final burial. This is consistent with the mixed character of the bone accumulations, which comprise both open-shelf forms (acanthodians, chondrichthyans) as well as those related to marginal-marine environments (placoderms and sarcopterygians). The bone-bearing succession has been subdivided into five depositional facies attributed to a coastal lagoon influenced by stormy, possibly tidal conditions. The occurrence of the invertebrate trace fossil Ilmenichnus sp. accompanied by Lockeia and Monomorphichnus supports this interpretation.

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Skamieniałości Antiarcha (Vertebrata, Placodermi) w dewonie Gór Świętokrzyskich

Szrek P.

Przegląd Geologiczny

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2006

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Vol. 54, nr 7

610-614

EN

The paper indicates a similarity between remains of various Palaeozoic fishes thus hindering identification of fossil of Antiarcha—rare placoderms in the Holy Cross Mountains. A comparison of the vertebrate fossil assemblage from Lode Famennian delta deposits in Latvia with that from the Lower Devonian “Placoderm Sandstone” of the Podłazie hill in the Holy Cross Mountains (Poland) shows their similarity. It indicates a fluvial (?deltaic) origin of the “Placoderm Sandstone” from Podłazie. Additionally, fragmentary antiarch plates are revealed from the Frasnian of the Wietrznia Quarry in Kielce (Holy Cross Mountains).

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Nowe dane na temat fauny kręgowców w "piaskowcach plakodermowych" z rejonu Daleszyc (Góry Świętokrzyskie)

Szrek P.

Przegląd Geologiczny

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2003

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Vol. 51, nr 5

409-411

PL

Na podstawie wstępnej analizy oznaczeń fauny z "piaskowców plakodermowych" Güricha (1896) oraz Czarnockiego (1919) i porównaniem ich z nową kolekcją (nr OS-223) stwierdzono, że oznaczenie tejże fauny na poziomie rodzajów i gatunków, jest bardzo niepewne i może budzić kontrowersje. Nie mogąc jednak przebadać kolekcji Güricha i Czarnockiego (zaginęły w czasie wojny), autor po analizie swojego materiału potwierdził obecność prawie wszystkich wymienionych przez Güricha (1896) i Czarnockiego (1919) rzędów i rodzin ryb pancernych. Stwierdzono występowanie licznych przedstawicieli Arthrodira, a także odcisków płyt przedstawicieli rzędu Antiarcha, którego obecność w dewonie świętokrzyskim w ogóle, była wątpliwa.

EN

Preliminary analysis of descriptions of "Placoderm Sandstone "fauna by Giirich (1896) and Czarnocki (1919), and comparison with the author 's new collection (no. OS-223), revealed that identification of that fauna at the species level is dubious. It is unlikely to see the Giirich and Czarnocki 's collections (lost during the war time). Review of the newly collected material confirmed the presence of almost all the orders and families of placoderm fish listed by Giirich and Czarnocki. Especially important is the rediscovery of fragments ofantiarchs, as the whose presence of the order Antiarcha in the Devonian of the Holy Cross Mountains was doubted. Besides, the presence of the Arthrodira representatives is documented.