†Spinacephalus Stitt 1970

Stitt 1970. Late Cambrian and earliest Ordovician trilobites, Timbered Hills and Lower Arbuckle Groups, Western Arbuckle Mountains, Murray County, Oklahoma. University Microfilms Inc., Ann Arbor, Michigan, 1970: 270 pp.

Stitt 1969. Late Cambrian and earliest Ordovician trilobite faunas, Western Arbuckle Mountains, Murray County, Oklahoma. Regional Geology of Arbuckle Mountains, Oklahoma., Guidebook Okla. geol. Surv. 17, 1969: 29-35, 5 figs. Chapter pagination: 29-35, 5 figs