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Devonian rugose corals of the Phillipsastrea hennahii species group

Wrzołek T.

Acta Geologica Polonica

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2005

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Vol. 55, no. 2

163-185

EN

Massive phillipsastreid tetracorals similar to Phillipsastrea hennahii, defined as a Ph. hennahii species group, are characterized by reduced intercorallite walls (thamnasterioid or subthamnasterioid habit), by variable but generally good development of horseshoe dissepiments at the tabularium/dissepimentarium boundary, and by strongly deflected peripheral platforms at corallite margins. Seven species of the Ph. hennahii species group, mostly from the Givetian of southern Euramerica, Iberia and northern Gondwana, are reviewed. Two species, the Middle Givetian Phillipsastrea sobolewi (RÓŻKOWSKA 1956) and the Late Givetian Phillipsastrea jachowiczi, a new species described herein, both from the Holy Cross Mountains (Poland) are described and illustrated. Also described from that area is Phillipsastrea falsa COEN-AUBERT 1987 from the Upper Frasnian.

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Depositional setting of the Devonian/Carboniferous biohermal Bol'shaya Nadota Carbonate Complex, Subpolar Urals

Skompski S., Paszkowski M., Krobicki M., Kokovin K., Korn D., Tomaś A., Wrzołek T.

Acta Geologica Polonica

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2001

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Vol. 51, nr 3

217-235

EN

Multi-stage development of carbonate buildups has been recognised in the Bol'shaya Nadota Carbonate Complex, in the vicinity of the town of Inta (Subpolar Urals). The growth of typical stromatoporoid-coral bioherms, characteristic of the Middle-Late Devonian stage, was terminated by the appearance of the shallow water oolitic facies, most probably at the beginning of the Famennian. During the Visean stage the carbonate platform was reconstructed, but algarbrachiopod-coral bioherms were characterized by relatively small dimensiones and an interfingering with organodetrital-oolitic facies. Sporadically, the inter-mound facies is represented by goniatite-bivalve coquinas with two new goniatite species: Goniatites olysya sp.nov. and Lusitanoceras kusinae sp.nov. The persistence of biohermal sedimentation in the Bol'shaya Nadota area is most probably caused by the specific position of the region on the boundary of two sedimentary-structural units: Lemva and Elets Zones, which corresponded to a basinal and a tectonically-active elevated part of a platform margin respectively. The overall biotic composition of the Carboniferous bioherms from Bol'shaya Nadota, situated in the northern periphery of Laurussia, falls generally within the diversity spectrum of Lower Carboniferous mounds described from the southern margin of the continent.

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Fauna Cyathaxonia a wymieranie koralowców Rugosa na granicy fran-famen

Wrzołek T.

Przegląd Geologiczny

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1999

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Vol. 47, nr 4

364-368

PL

Drobne osobnicze koralowce Rugosa (fauna Cyathaxonia) pospolite są w dewonie środkowym, bardzo rzadkie we franie i ponownie rozkwitają w famenie, gdy pojawiają się nowe rodzaje. Takie rozprzestrzenienie sugeruje raczej pożywecki, a nie pofrański kryzys w badanej grupie. W Górach Świętokrzyskich fauna Cyathaxonia dość często występuje w utworach głębszego szelfu, głównie wieku eifelskiego i żyweckiego. Jej reprezentanci należą do rodzin Metriophyllidae, Laccophyllidae i Stereolasmatidae. Ta ostatnia jest typowa dla środkowego dewonu królestwa biogeograficznego Wschodnich Ameryk (EAR) i, obok zafrentidów Heliophyllum i sifonofrentidów "Breviphrentis" ze strefy łysogórskiej, reprezentuje w Górach Świętokrzyskich imigrantów z EAR do królestwa Starego Świata.