Alcatraz Penitentiary - SOLD 2.75" Showcase Concrete mm1 Above: Artist's Concept of the

Above: Artist's Concept of the Tethys Sea during the Cretaceous (Source: Mini Museum)

The set is enclosed in a specimen jar with a removable top which arrives in a handsome

and used its powerful bite to take down prey in packs

Daniel Kirkwood noticed gaps in the Asteroid Belt at locations corresponding to specific fractions of Jupiter's orbit around the Sun

Alcatraz Penitentiary - SOLD 2.75" Showcase Concrete mm1 Above: Artist's Concept of theThis is an authentic piece of concrete from Alcatraz Penitentiary. Yes, an actual piece of The Rock!" This particular specimen measures 2. 75" 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.