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Abstract
Paleoecology and Biostratigraphy
Tabulata from the Uppermost Emsian and the Eifelian of Poland
Abstract
The present study is concerned with the Emsian and Eifelian deposits representing the initial phase of shallow marine development in the pericratonic basin of NW, central and SW Poland. Highly diversified tabulate corals form a common component of rich benthic assemblages occurring mostly in marly carbonate facies. They have been best studied in the Holy Cross Mountains, central Poland, where they range from the uppermost Emsian through the Frasnian stages. Recent conodont findings suggest that some of the Tabulata-bearing deposits regarded so far as Eifelian in age should be properly assigned to the uppermost Emsian. This would considerably lower the stratigraphical range of several taxa.
The uppermost Emsian and Eifelian deposits have yielded 30 species of Tabulata belonging to three orders: Favositida (families: Pachyporidae, Favositidae, Alveolitidae and Coenitidae), Syringoporida (families: Syringoporidae, Multithecoporidae), Auloporida (families: Auloporidae, Kozlowskidae, Aulocystidae). Most of the taxa so far described should be assigned to the patulus and partitus zones of the standard conodont zonation. The species in question display a wide paleogeographical range being known from the Middle Devonian of Western Europe and Lower-Middle Devonian of USSR (mostly Kuznetsk Basin). Some of the Polish forms range up to the Givetian and a few of them even to the Frasnian. Short-ranging taxa also occurred which may be of importance as index fossils. One example is Alveolites praelimniscus Le Maitre described from the upper Emsian of Spain and associated in the Holy Cross Mountains with the index conodont subspecies Icriodus corniger retrodepressus Bultynck.
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