Pikaia gracilens, specimens from the Burgess Shale, replica Pachycephalosaurus It is estimated that those

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

For this to happen the wood needs to be buried in an environment both low in oxygen (preventing decomposition) and with flowing

The white lines are representative of fractures healed with calcite in the original specimen

Tinker is one of the most scientifically significant and most exciting T-rex skeletons ever found

in the Gobi Desert

Pikaia gracilens, specimens from the Burgess Shale, replica Pachycephalosaurus It is estimated that thoseA 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