Trilobite Group
Including a trilobite, Elrathia, Cambrian, Wheeler Formation, Milliard County, Utah; a trilobite, Phacops americanus, mid-Devonian period, Morocco; a trilobite, Calymene, Silurian to middle Devonian; and others. Together with three copies of Geological Enterprises, Ardmore, Oklahoma, Bulletins from 1973-1975. (lot)