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52" polished Cleoniceras fossil from Madagascar
337" Devonian Period trilobite fossil
Above: Varied material from the Deccan Traps
by a factor of five
Alcatraz Penitentiary - 2.603" Showcase Concrete rockinabox 52" polished Cleoniceras fossil fromThis is an authentic piece of concrete from Alcatraz Penitentiary. Yes, an actual piece of The Rock!" This particular specimen measures 2. 603" 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.
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