Knitter, H. (1983). Biostratigraphische Untersuchungen mit Ostracoden im Toarcien Süddeutschlands. Facies. 8:213-262.

203561

Knitter, H.

1983

8:213-262

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Twenty sections from the Toarcian of Southern Germany (Fig. 1) have been studied for ostracods. Seventeen of these sections were boreholes and three outcrops. The sections Ballrechten SW of Freiburg i. Br., Jebenhausen near Göppingen and the well Pappenheim are subdivided stratigraphically with ammonites (Ohmert 1976, Urlichs 1977, Urlichs personal communication). All ostracods come from the Upper Toarcian. 37 Species were found. Ten new species have been established: Bairdia inflata n. sp. (Upper Toarcian), Bythocypris faba n. sp. (Upper Toarcian), Cytherella reticuloornata n. sp. (?levesquei-subzone and higher) Aaleniella reticulata n. sp. (Upper Toarcian), Cytheropteron (Infracytheropteron) rarum n. sp. (Upper striatulum-subzone and higher), Rutlandella striata n. sp. (Upper Toarcian), Eucytherura angulocostata n. sp. (Upper-Toarcian), Kinkelinella (Kinkelinella) costata n. sp. (Upper Toarcian), Praeschuleridea tenera n. sp. (variabilis to middle dispansum subzone). Two species are described in open nomenclature: Gen. et sp. indet. 1 (upper striaculum-subzone and higher), Gen. et sp. indet 2 (upper striatulum-subzone). It was possible to establish a stratigraphy based on ostracods and to subdivide the Upper Toarcian into 11 faunal zones (see Fig. 3), which were used to determine the age of the samples from the boreholes. In Franconia the ostracod faunas start within the lower dispansum subzone. The thickness of the Toarcian in Franconia ranges from less than 5 m to about 20 m. The thickest sections are in places with only thin Upper Pliensbachian beds. Condensations of the Upper-Pliensbachian point to a submarine erosion during this time. The lack of sediment becomes compensated during Toarcian times. The problem of the Posidonia Shale facies is discussed (Section 8): Paleogeographical speculations give evidence to a transport of nutrients, responsible for a very high plankton production,from southern (Penninic trough) to the northern epicontinental area.

Germany

Systematics, Taxonomy

Ostracoda

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