a large ammonite on display at the royal tyrrell museum. this particular specimen exhibits the rather unique preservation known as ammolite. this is only known to occur in ammonites fossilized near the northern rocky mountains.
the photo doesn't do it credit, this shell actually refracts the whole light spectrum rather like a CD or DVD. very pretty and cool! these particular shells (coming from a common and well understood species) are mined for use in jewelry. due to its beauty and abundance in the province, ammolite is alberta's official gemstone.