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Hildoceras semipolitum ammonite shell fossil - Whitby, North Yorkshire

Hildoceras semipolitum ammonite shell fossil - Whitby, North Yorkshire

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Ammonite fossil found near Whitby, North Yorkshire Jurassic Coast 

Squared top with a strong keel bordered either side by a groove are distinctive features.  Spiral groove (indentation on the side of the whorls) and sloping umbilical wall (bottom edge of the whorl).  Curved sickle-shaped ribs, which are strongest above the spiral groove.  Can reach large size (over 6 inches), although 4 inches or less more common. A more slender and fine ribbed form/species Hildoceras semipolitum (Buckman, 1902) can be found at Ravencar.

Actual ammonite size 6.7cm 

Age (lithology): Upper Lias; Toarcian; Bifrons zone; Fibulatum and Crassum subzones.


Distribution: Port Mulgrave, Kettleness, Sandsend, Saltwick, Runswick, Hawsker, Ravenscar.


Occurrence:  Common


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All of our available specimens are collected and sourced by ourselves or local trusted collectors and we can guarantee the fossil you will receive is 100% genuine. You will be made aware of fossils with any restoration in the description of the fossil.