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TF0403 - Belemnite
Location
Oxford Clay, Warboys Pit, St Ives
Species
Hastatus spp.
Stratigraphic Range
Jurassic
Taxonomy
Phylum: Mollusca
Class: Cephalopoda
Order: Belemnitida
Genus: Hibolites
Class: Cephalopoda
Order: Belemnitida
Genus: Hibolites
Distinctive Features
'Bullet' shape
Guard with radial crystals
Hollow phragmocone area
Guard with radial crystals
Hollow phragmocone area
Preservation
Mineral replacement of calcitic guard
Dissolution of aragonitic phragmocone
Sediment infil of phragmocone area
Dissolution of aragonitic phragmocone
Sediment infil of phragmocone area
Advanced notes
Hibolites are not as bullet shaped as most belemnites, and at first glance could be confused with an Echinoid spine. However the radial arrangement of crystals and the presence of a hollow region where the phragmocone would once have been allows us to, after some examination, confirm these specimens as belemnites.