Amazing split ammonite split pair with with pyrite, aragonite, and calcite.
Genus/Species: Speetoniceras sp.
Age: Early Cretaceous/Hauterivian (129.4 – 132.9 million years)
Location: Deposits of the Volga River, Ulyanovsk, Russia
Dimensions: (Both halves are 11.75″ tall x 10.25″ wide) x (Left half is 1.35″ thick / Right half is 1.5″ thick)
Weight: Left half is 6.55 lbs / right half is 8.1 lbs