Pyrited ammonite split and polished pair.
Genus/Species: Speetoniceras sp.
Age: Early Cretaceous/Hauterivian (129.4 – 132.9 million years)
Location: Deposits of the Volga River, Ulyanovsk, Russia
Dimensions: halves are both approximately 12″ tall x 11″ wide x 1.6″ thick
Weight: left half is 7.76 lbs / right half is just a hair under 9 lbs