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On the hettangian sinemurian boundary in extra carpathian poland a discussion

, : On the hettangian sinemurian boundary in extra carpathian poland a discussion. Bulletin de l'Academie Polonaise des Sciences Serie des Sciences de la Terre 23(2): 119-122

Problems of the Jurassic Hettangian-Sinemurian boundary in view of palynological data are discussed. The arguments of Karaszewski are thought invalid for 2 reasons: the scarcity and limited value of floral evidence as compared with ammonite evidence, and the lack of correlation between floral and ammonite data [Nathorstisporites hopliticus, Thaumatopteris schenki and Aratrisporites minimus are mentioned.].

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Related references

Karaszewski W., 1974: On the Hettangian - Sinemurian boundary in the extra-Carpathian Poland. Bulletin of the Polish Academy of Sciences, Earth Sciences 22(1): 33-36

Bloos G., 1996: The Hettangian/ Sinemurian stage boundary; further observations. GeoResearch Forum 1-2: 119-128

Suzuki, H.; Prinz Grimm, P.; Schmidt Effing, R., 2002: Radiolarians from the Hettangian/Sinemurian boundary of northern Peru. Well-preserved radiolarians are described from the Lower Jurassic of Tingo, Utcubamba valley, northern Peru. The section "Cerro Negro" is well dated by ammonites. The radiolaria-bearing horizon can be correlated with the Pseudaetomoceras...

Taylor D.G., 1986: The Hettangian-Sinemurian boundary (early Jurassic); reply. Newsletters on Stratigraphy 16(2): 57-67

Mergen P., 1983: New data on Hettangian-Sinemurian boundary at Metzert, Arlon. Bulletin de la Societe Belge de Geologie = Bulletin van de Belgische Vereniging voor Geologie 92(1): 55-60

Guex J.; Taylor D., 1976: The Hettangian-Sinemurian boundary in the Prealps of western Switzerland and in Nevada. Eclogae Geologicae Helvetiae 69(2): 521-526

Von Hillebrandt, A., 2000: Ammonite biostratigraphy of the Hettangian/Sinemurian boundary in South America. Georesearch Forum 6: 105-117

Marcinkiewicz Teresa, 1969: Rhaetian-Liassic boundary in the extra-Carpathian area of Poland based on fossil flora. Limnic Wielichowo beds (Rhaetian) contain Trileites pinguis assemblage, overlying Mechowo beds (Liassic) contain Nathorstisporites.

Pienkowski G., 1991: Eustatically controlled sedimentation in the hettangian sinemurian early jurassic of poland and sweden. In earliest Jurassic times, terrigenous, continental and marginal marine deposition occurred in a large epeiric basin along the Tornquist Line in Europe. Detailed sedimentological studies allow recognition of palaeoenvironmental fluctuations in sp...

Hylton M.D., 1998: A preliminary analysis of the Foraminifera from the Hettangian-Sinemurian boundary of East Quantoxhead, West Somerset. The coastline of West Somerset has long been recognised as containing a classic example of Lower Lias (Lower Jurassic) geology consisting of alternating cycles of shale and limestone ("Blue Lias" facies). Recent investigations of the pal...