Burgess Shale's Weird Wonders
The fossils found in the Burgess Shale include the 500-million-year-old ancestors of most modern animals
- By Smithsonian.com
- Smithsonian.com, July 16, 2009
(J.B. Caron, with permission of the Royal Ontario Museum and Parks Canada © ROM)
Haplophrentis carinatus, a one-inch fossil found at the Stanley Glacier site, was probably related to an extinct group of mollusks. The preserved parts consist of a conical shell, a lid and a pair of curved elements projecting sideways. This animal is abundant at the site and lived on the seafloor.