Burgess Shale Fossils

Looking across Emerald Lake at Wapta Mountain and the ridge near the Burgess Shale fossil quarries, Sept. 2012, Yoho National Park.

When we were in Field, B.C. this summer, I first heard about the Burgess Shale fossils in Yoho National Park.  The Burgess Shale quarries have been designated a World Heritage Site by UNESCO.  Indeed, the entire park is part of a World Heritage Site.  Because of the force of the land’s beauty, I bought a small book, A Geoscience Guide to The Burgess Shale by Murray Coppold and Wayne Powell to begin learning about the fossils.  I’m using that book and How Old is That Mountain? by Chris Yorath as references in this post.

The name Burgess Shale refers to a segment of layered rocks, called a formation.  It’s within this particular formation that the fossils of well preserved soft bodied creatures were found.  This is a big deal because it’s much more common to find only the skeletons of animals without their soft tissues being preserved.  

Mt. Stephen seen from Field, B. C.

The Burgess Shale fossils were first found in 1909 on a ridge between Wapta Mountain and Mt. Field.  And on nearby Mt. Stephen, many trilobite fossils have been found.  I’ve compared my photos of mountains in the area to several online photos.  From this comparison, I’ve included two photos I took that I believe show the area close to the the Burgess Shale fossil quarries as well as Mt. Stephen.

Mt. Stephen seen from Field, B. C., September 2012. Trilobite fossils have been found on this mountain, though I believe the exact location is further to the right on the western slope.

While I gather that there’s no one exact indication of the age of the fossils, the two books I’ve mentioned indicate they are between 530 and 505 million years old.  In A Geoscience Guide to The Burgess Shale the authors compress the earth’s history into a single year to help us fathom the enormous sweep of time of the planet’s history.  If the birth of the earth is imagined to be on January 1, then the animals of the Burgess Shale appear on November 20^th.  As a comparison, dinosaurs who seem incredibly old to us are more recent than the fossils, appearing between December 21^st and 27^th.  And humanity’s ancestors appear at 9:07 p.m. on December 31^st.  Homo sapiens, our exact species, only appear on December 31^st at a quarter to midnight!  We are the newcomers on earth.

Back in Toronto, wearing the Burgess Shale T-shirt, November 2012

Because of my new interest, I indulged in the common tourist activity of buying a t-shirt memento of this part of our travels.  The shirt has a rendition of some of the amazing looking fossilized creatures of the Burgess Shale.  I look forward to wearing it around Toronto next spring and summer.  I will certainly receive puzzled looks from people who are not paleontology buffs, wondering what on earth it’s about.  What on earth, indeed!