The Yellowstone region's Beartooth Mountains feature some of the most ancient rocks in North America — as old as 3.96 billion ...

Difficult to imagine today, the sedimentary rock formations date back almost 500 ... All of these and much more make the archipelago a unique part of Canada’s natural heritage.

Whether sedimentary rocks store fossil hydrocarbons or act ... a researcher at the University of Calgary in Canada. "The pore ...