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Hildoceras Ammonite, from Whitby, Yorkshire, England (No.114)

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Hildoceras Ammonite, from Whitby, Yorkshire, England (No.114)

Hildoceras Ammonite, from Whitby, Yorkshire, England

Jurassic Period, 175 Million Years Ago

Measurements Approx.
Height - 3 cm
Width - 5.5 cm
Length - 7 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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