By Kennedy W.J., Cobban W.A.
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Additional resources for Aspects of ammonite biology, biogeography and biosratigraphy
1973, fig. 7. 54 AMMONITE ECOLOGY noted in our introductory statement, in particular larval and post-larval planktonic nektonic life habits and post-mortem drift by ocean currents. Pandemic forms generally exhibit a high degree of facies independence (we have collected T. costatus in calcareous and noncalcareous shales (crushed, in concretions, and pyritized), bioclastic limestones, chalks, greensands, phosphatic conglomerates, and clastic sediments ranging from silt to gravel. It occurs in geographical situations ranging from outer shelf to near shore); and, from its wide latitudinal spread it would seem to have been eurytopic.
12, Sigaloceras micans; 13, Dactylioceras commune. C r o s s m a r k s a p p r o x i m a t e p o s i t i o n o f centre o f b u o y a n c y . D o t m a r k s a p p r o x i m a t e p o s i t i o n s o f centre o f gravity. F o r d i s c u s s i o n see text. 34 AMMONITE ECOLOGY 2. After metamorphosis a number of possible life styles emerged: (a) Geographic distribution of many groups and strong substrate controls on the distribution of others suggest a benthonic habit during post-larval life, especially for some heteromorphs and strongly ornamented forms.
The Cenomanian species of the Acanthoceras rhotomagense (Brongniart) group provides a typical example of the problem. The group as a whole ranged throughout the Middle Cenomanian, although it was common only in the lower two-thirds of the substage. In Europe at least two successive populations of A. rhotomagense can be recognized, differing chiefly in details of ornament and population structure. In Zululand the group reappears in large numbers, again with high variability, under the name of A.