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Palaeogeographical distribution of early Bathonian ammonites of the Asphinctites-Polysphinctites group

Bronislaw Andrzej, Matyja and Wierzbowskl, Andrzej (2001) Palaeogeographical distribution of early Bathonian ammonites of the Asphinctites-Polysphinctites group. Hantkeniana, 3. pp. 89-103. ISSN 1219-3933

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Abstract

The study of ammonites representing the dimorphic pair Asphinctites tenuiplicatus (Brauns) — Polysphinctites secundus (Wetzel) in the Tenuiplicatus Zone of Lower Bathonian in Central Poland, reveals their abnormal large sizes when compared with those occurring in other areas of Europe. The biogeographic distribution of the discussed ammonites, as well as older representatives of Asphinctites and Polysphinctites shows a general decrease in size of both forms towards south from the Submediterranean Province to the Mediterranean Province, and to the general disappearance of Polysphinctites in the Mediterranean Province. The phenomena may be related to changing environmental conditions which influenced the development of the discussed ammonites. We suggest that the ammonites inhabiting more distant areas from the Mediterranean Province, at the periphery of geographic range of the species, could have reached larger sizes due to prolonged time of maturation.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH526 Paleontology / őslénytan
Depositing User: Zsolt Baráth
Date Deposited: 27 Jan 2023 10:03
Last Modified: 27 Jan 2023 10:03
URI: http://real.mtak.hu/id/eprint/157537

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