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Promicroceras Planicosta Ammonite Group, from Black Ven, Lyme Regis, England (No.121)
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Promicroceras Planicosta Ammonite Group, from Black Ven, Lyme Regis, England (No.121)Promicroceras Planicosta Ammonite, from Black Ven, Lyme Regis, England
185 Million Years, Jurassic Period

Measurements Approx.
Height - 7.4 cm
Width - 2.7 cm
Length - 15.5 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.