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Exceptional Cambrian Fossils from Utah: A Window Into the Age of Trilobites (MP 15-1) Fire with a visual key toBy: Richard A. Robison, Loren E. Babcock, and Val G. Gunther Few places have a better fossil record of Cambrian life than Utah. In Exceptional Cambrian Fossils from Utah: A Window Into the Age of Trilobites, the authors present an exhaustive summary of invertebrate fossils collected from Utah's Spence, Wheeler, Marjum, and Weeks Formations. The fossils include sponges, jellyfish, comb jellies, snails, velvet worms, and of course trilobites, among many