1. D. H. Amos G. A. Desborough Mafic intrusive rocks of Precambrian age in southeast Missouri Rep. Inv. 47 22 1970
2. Some age relations and structural features of the Precambrian volcanic terrane, St. Francois Mountains, southeastern Missouri;Anderson;Geol. Soc. Amer. Bull.,1969
3. R. E. Anderson Ash-flow tuffs of Precambrian age in southeast Missouri Rep. Inv. 46 50 1970
4. Geochronology of Precambrian rocks in the St. Francois Mountains, southeastern Missouri;Bickford;Geol. Soc Amer. Spec Pap.,1975
5. S. Chaudhuri D. G. Brookins G. Fanre Rubidium-strontium ages of Keweenawan intrusions near Mellen and South Range in Wisconsin 1969