Mystery traces

For my first post on this blog, I'm going to share some photos of some mysterious traces a friend of mine discovered in August 2010 when we were doing field work in west-central Alberta. I've shown the photos to a few people in the geoscience department at the University of Calgary, but no one knows what it is. My first guess of some sort of cross between a deer and a trilobite seems unlikely.

Maybe there is someone out there who can solve the mystery...

Here's what is known about them:
-Found covering one side of a large boulder in a pile of rocks at the base of some cliffs
-The cliffs are cherty limestone, from the Lower Jurassic Nordegg Member of the Fernie Formation
-The rock is probably also Nordegg, but if it came from high enough up, it could be from the Rock Creek Member. It was wet and muddy and we didn't spend a lot of time figuring out what it was.