Here is an outstanding U.S. trilobite. This is Presbynileus ibexensis from the Ordovician of Utah. This rare trilobite is almost perfectly prone and wonderfully articulated. Both free cheeks are intact and tightly attached. The extremely 3-dimensional bug exhibits no crushing of the exoskeleton. It has fabulous, natural coloration and great contrast with the gray matrix. It is extremely well centered on the plate of limestone. This trilobite has been part of the DeRosear Collection for a number of years. Quite simply, this specimen is "as good as it gets".