Cleaning a nodule, it has been left in its original matrix measuring 15.1 x 12.2 cm. The ammonite measures about 6.2 cm in diameter and preserves the shell, natural opalescence.
Delivered with support. It will be packed very carefully and shipped with online tracking and insured.
*Sphenodiscus is an extinct genus of acanthoceratacean ammonite. The genus has been found from many continents and is thought to have had a large global distribution during the Maastrichtian stage of the Late Cretaceous.
- On matrix
- Scientific name
- Sphenodiscus lenticularis
- S. Dakota, USA
- Geological Period
- Late Cretaceous, Maastrichtian, Fox Hills Formation
- Good condition
- 1218 g