| mhorn | Дата: Monday, 24.09.2012, 21:36 | Сообщение # 1 |
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| Dietze, V., Auer, W., Chandler, R.B., Neisser, E., Hummel, U., Wannenmacher, N., Dietl, G. & Schweigert, G. (2012) The Ovale Zone (Middle Jurassic, Early Bajocian) at its type locality near Achdorf (Wutach area, southwestern Germany) // Zitteliana A 52, P.97-118.
pdf http://www.palmuc.de/bspg....tze.pdf
Fissilobiceras ovale (Quenstedt, 1886) is the index species of the Early Bajocian Ovale Zone as well as of the ovale horizon in the Jurassic of SW Germany. The variability of the species F. ovale in its type horizon (ovale horizon, in the lowermost part of the “Unterer Wedelsandstein”) and type locality (Achdorf) is described. The Discites Zone is documented with a rich fauna of Hyperlioceras spp. and Sonninia spp. up to the base of the “Unterer Wedelsandstein”, that represents the beginning of the ovale horizon. Sometimes specimens of Hyperlioceras co-occur with F. ovale in the same bed. However, the lithology of the Hyperlioceras specimens from the base of the
“Unterer Wedelsandstein” Member is significantly different from the surrounding matrix, and hence, these specimens are now recognized as re-worked from the topmost ”Sowerbyi-Oolith”. Above the ovale horizon follows the oechslei horizon (Ovale Zone) in the “Unterer Wedelsandstein” Member.
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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