Arnioceras sp. - Dorset, UK

A particularly unusual Arnioceras sp., this specimen was found in a calcite vein within a septarian concretion. The resulting preservation is beautiful, showing a two-tonal pattern of pale and dark browns. 

Age: Lower Jurassic, approximately 195 million years old.

Location: Dorset, UK.

Size of ammonite: 45 mm.

Size of block: Approximately 90 mm x 80 mm at its largest points.