Ammonites were a type of marine mollusk that existed during the Devonian to Cretaceous eras (400-65 million years ago), having spiral coiled shells.  Small ones found in rock shops can often be irridescent.  The Fernie ammonite is located in a gully up the mountainside outside of Fernie, British Columbia & is known to be one of the largest known fossil ammonites in the world, being nearly 1.5 metres across & over 150 million years old.  It was discovered in July 1947 by a student of Chuck Newmarch of the British Columbia Geological Survey.  Upon venturing up the creek searching for coal seams they had spotted it & thought it was a fossilized truck tire until further analysis revealed it as an ammonite, scientific name Titanites occidentalis.  While large portions of it are missing & close-up details are relatively poor, it remains a fascinating sight particularly in relative size to a person.  In more recent years a few other large ammonites have been found though this one remains the first discovery as it sits at an angle in the matrix high in a coniferous forest, an extreme contrast to when the organism was once alive at the bottom of the ocean floor.