Promicroceras planicosta Ammonite, from Charmouth, UK (No.32)

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Promicroceras planicosta Ammonite, from Charmouth, UK (No.32) Promicroceras planicosta Ammonite, from Black Ven, Charmouth, UK

Measurements Approx.
Height - 9.3 cm
Width - 3 cm
Length - 10.1 cm



Promicroceras is a species of Ammonite is found in rocks of Lower Jurassic age and came from Europe.

  

This genus is characterised by an evolute shell, with the individual whorls overlapping only slightly; all the whorls are clearly visible. In cross-section the whorls are rounded. Thick, well-spaced ribs cross the shell and radiate from the central umbilicus. As the ribs reach the ventral surface they curve slightly and become flattened.

 


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