Hildoceras Ammonite, from Somerset, England (No.60)

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Hildoceras Ammonite, from Somerset, England (No.60)Hildoceras Ammonite, from Somerset, England
160 Million Years, Jurassic Period

Measurements Approx.
Height - 7.6 cm
Width - 1.9 cm
Length - 6.4 cm



Hildoceras had an evolute, laterally compressed shell. The coarse, widely-spaced, sickle-shaped ribbing on the sides is interrupted by a groove.

The suture line is very complex. It has a very distinctive rectangular whorl section, which on the venter carries three low keels separated by two grooves.

Hildoceras was a moderate swimmer in the Early Jurassic shelf seas.





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