Comparative paleontology and stratigraphy of Valanginian - download pdf or read online

Comparative paleontology and stratigraphy of Valanginian - download pdf or read online

By Jeletzky J.A., Kemper E.

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Read Online or Download Comparative paleontology and stratigraphy of Valanginian Polyptychitinae and Simbirskitinae in Sverdrup Basin (Arctic Canada) and Lower Saxony Basin (NW Germany) PDF

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Extra resources for Comparative paleontology and stratigraphy of Valanginian Polyptychitinae and Simbirskitinae in Sverdrup Basin (Arctic Canada) and Lower Saxony Basin (NW Germany)

Example text

Holotype. Specimen figured by Kemper (1976, PI. 23, fig. 12) is the holotype of Paratollia tenuicostata by original designation. BGR, Hannover, kv 58. Locus typicus. Suddendorf. Stratum typicum. Upper Platylenticeras-Beds, lower lower Valanginian. Material. 4 specimens from Suddendorf. Diagnosis. A large species for the genus with narrow umbilicus and rather thick whorls (width greater than height). Sculpture is dense and fine. The ribs are high and form predominantly bidichotomous bundles, at least in the intermediate and adult growth stages.

All of the above mentioned, figured specimens from Northwest Europe exhibit a basically polyptychitinid sculpture with clearly expressed senile features. Furthermore, they have only a small number of high and large bullae. The true Euryptychites species posses, in contrast, a considerably greater number of finer bullae. These bullae, as a rule, extend much farther forward on the umbilical wall. They also sit on the generally acute umbilical shoulder, which represents in this genus a true acute rim.

Early early Valanginian. Note t h e linear scale. Ieusurmenls (in mpnl. - - - Description. E, dipfotomus represents a morphologicaI and phylogenetical connecting link between Propolyptychites and the progressive Eur}>prychitesspecies. - variability, it is a good, well dcfined species which is restricted to the Iower lower Valanginian. This species may even serve as an example of the variability of rootforms in their centers of evolutionary development. All morphological features are variabIe and none of the 23 specimens agrees completely with any other, The species varies from an intermediate to a large size, though the largest whorl diameters d o not appear to exceed 200 mm diameter.

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