Half-billion-year-old


'Rockies:'Mother Lode' Of Half-Billion-Year-Old Fossils Found

Rockies:'Mother Lode' Of Half-Billion-Year-Old Fossils Found

The Burgess Shale, one of the world’s most remarkable fossil formations, has yielded yet another extraordinary glimpse into the...

Mar 10 2014, 7:26am CDT