Pikaia gracilens, specimens from the Burgess Shale, replica Pachycephalosaurus and traces of worms and

and traces of worms and trilobite tracks (called Cruziana)

The name means "underworld"

It is estimated that those tiny arms could still curl over 400 pounds

The overall height is 10 feet 2 inches

Pikaia gracilens, specimens from the Burgess Shale, replica Pachycephalosaurus and traces of worms andA primitive chordate from the Burgess Shale More than 1 2 billion years old, the fossils of the Burgess Shale fauna preserve for us an intriguing glimpse of early animal life on Earth. These fossils are named after a Cambrian rock formation (the Burgess Shale) that is located in the western Canadian Rockies. They were first discovered there in 1909 by Charles D. Walcott, then Secretary of the Smithsonian Institution. Living among the variety of