LARGE 1 5/8" Asaphiscus wheeleri Trilobite FossilAuthentic, nice and high quality 2. 5 lb. and 1 5 8" long Asaphiscus wheeleri fossil trilobite molt on an approximate 4" tall x 5. 25" x 1. 25" deep cut shale to stand on its own. Remnants of the free cheeks can also be seen below the trilobite molt. These cheeks are detached during the molting process. Stand and information card included. Age: Middle Cambrian. Approximately 505 million years old. Found in the Utah West Desert, Antelope Springs, House