Alcatraz Penitentiary - 3.019" Showcase Concrete bundle 690" and was recovered from

690" and was recovered from the Black Sea

these fossils are important indicators of the prehistoric shark's territory and diet

causing a rain of debris

Please Note: We have not stabilized this material with resin

These adaptations created a stronger shell to protect the ammonite from predators millions of years ago

Alcatraz Penitentiary - 3.019" Showcase Concrete bundle 690" and was recovered fromThis is an authentic piece of concrete from Alcatraz Penitentiary. Yes, an actual piece of The Rock!" This particular specimen measures 3. 019" along the widest point. This specimen, from the famous Alcatraz Island, saw some 1,500 prisoners pass by it during the prison's operation. A certificate of authenticity is included.