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The Muschelkalk, Keuper and Lias of the Mittelland canal section near Sehnde, Lower Saxony
| Beutler, G., Heunisch, C, Luppold, F.W., Rettig, B. and R÷hling, H.-G. | |
| 1996 | |
| Geol. Jb. A145, pp. 67-197, 25 platesGeol. Jb. A145, pp. 67-197, 25 plates | |
| The Muschelkalk, Keuper and Lias of the Mittelland canal section near Sehnde, Lower Saxony |
Beutler, G., Heunisch, C, Luppold, F.W., Rettig, B. and R÷hling, H.-G., 1996. The Muschelkalk, Keuper and Lias of the Mittelland canal section near Sehnde, Lower Saxony. Geol. Jb. A145, pp. 67-197, 25 plates Abstract: Sections frorm the Upper Muschelkalk (Middle Triassic) up to the marine Lower Cretaceous on the eastern flank of the Sehnde salt dome were temporarily exposed in 1991 and 1992 during construction of new embankments for the Mittelland canal near Sehnde (Hannover, Lower Saxony). This publication describes the sequence from the Upper Muschelkalk to the Lower Lias, in particular the Keuper sequence, which is 420 m thick. A lithological description and a gamma ray log are given. Important marker horizons, e.g. Grenzdolomit, Engelhofer Platte, Isenberg-Horizont and Beller Horizont, have been identified for the first time in this part of eastern Lower Saxony. The gamma ray log, which was compiled from about 15,000 single measurements, is calibrated by means of these markers and correlated with borehole sections from NW Germany. The palaeontological investigations were concentrated on selected lithological units and on special groups of fossils. In the Upper Muschelkalk, conodont Zone 7 of KOZIJR (1968a) was identified. Two new species, Nanacythere zigzag n.sp. and Krausella sehndensis n.sp. have been described from the Lias. Altogether 42 samples from the Upper Muschelkalk to the Lower Lias have been investigated palynologically. The samples from the Middle Steinmergelkeuper are correlated with the Norian stage of the Tethys stratigraphy. The samples from the Rhaetian and Lower Lias were classified using the zonal scheme of LUND (1977). The Middle Rhaetian succession contains a diverse phytoplanktonic microflora indicating deposition in an open marine environment in a mid-basin position.