A new late Givetian rhynchonellid species from the Holy Cross Montains, Poland, and its relevance to stratigraphical and ecological problems near the Givetian/Frasnian boundary
Sartenaer, P.; Racki, G (1992). A new late Givetian rhynchonellid species from the Holy Cross Montains, Poland, and its relevance to stratigraphical and ecological problems near the Givetian/Frasnian boundary. Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 62: 61-73
In: Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. Aardwetenschappen = Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. KBIN: Brussel. ISSN 0374-6291, meer
A new rhynchonellid species, Hadrotatorhynchus laskowaensis, is described from the Klapperina disparilis Zone of the Holy Cross Mountains in Poland, and its stratigraphical and ecological meanings are stressed. The species is another example of the importance of the genus Hadrotatorhynchus SARTENAER, 1986 both as a tool for correlating late Givetian beds and as an element of the succession of the rhynchonellid genera Hadrotatorhynchus - Phlogoiderhynchus SARTENAER, 1970 across the Givetian/Frasnian boundary. In the Lysogory facies region this boundary can consequently be placed near the top of the middle member of the Szydlowek Beds composed of marly shales containing large-sized P.polonicus (ROEMER, 1866), and succeeded by the upper member, which is characterized by a small-size variety of the same species, and is mostly composed of platy marly limestones passing laterally into detrital beds. Hadrotatorhynchus laskowaensis n.sp. thrived in shallower water than the succeeding Phlogoiderhynchus polonicus, and forms chiefly monospecific shell banks on the storm-disturbed, prograding carbonate slope bordering the Lysogory intrashelf basin.
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