1 resultado para Holz, Arnold Gregory, 1937-
em Institutional Repository of Leibniz University Hannover
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Resumo:
The belemnite species Hibolites jaculoides Swinnerton, 1937 is redefined on the basis of a bed by bed collection of 2100 rostrums from the Upper Hauterivian (Cretaceous deposits of NW Germany and Yorkshire, England. According to the variate-statistical evaluation of the data gathered, definite phylotic changes are disdernible within the species. All characters measured indicate a definite tendency towards reduction in size. Large-sized, club-shaped specimens are typical for the stratigraphically older beds, delicate and slender-built forms dominate in the upper Upper Hauterivian. Comparison of the material from England and Germany yielded that three of the varieties described by Swinnerton are limited mainly to the lower Upper Hauterivian of England.