The world of the dinosaurs was populated by some of the most gargantuan and charismatic animals ever to roam our planet. It is easy to forget that the Mesozoic Era was just as rich with all sorts of life as our modern world. This is the shell of a freshwater snail called Campeloma. This shell was collected by the late Harley Garbani and is part of a collection donated to the Western Science Center by his wife, Mary.This Campeloma was found in the Hell Creek Formation of Montana and is about 67 million years old (Late Cretaceous Epoch). While this little snail scooted along the bottom of ponds and streams, the last of the giant dinosaurs, such as Tyrannosaurus andTriceratops, thundered across the land. Living species of Campeloma still inhabit freshwater environments in the United States and Canada.