Frontlines | Trilobites: Living on the Edge Courtesy of The Yoho-Burgess Shale Foundation The most familiar and abundant species of trilobites in North America may have followed an exotic survival ...

Digging into the rock reveals that its color is actually bluish-gray. The limestone contains the fossilized remains of fish, mollusks, trilobites, crinoids, and corals. These layers of sedimentary ...