Heteromorph Hook Ammonite - Ancyloceras Style Fossil

A heteromorph, or uncoiled, ammonite in the style of Ancyloceras. The preview shows a tight open spiral at the start, then a long straight shaft, then a broad U-shaped hook ending in the aperture. The whole shell is covered in close-set ribs with small knobs along them. One piece, lying flat, about 8.4 cm long. Most ammonites coiled in a flat spiral, but heteromorphs broke the pattern with open coils, straight shafts and hooks. Ancyloceras lived in the Early Cretaceous, roughly 130 to 113 milli…

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