Brookins, Douglas G., and Michael J Woods. 1970. “Rb-Sr Geochronologic Investigation of Basic and Ultrabasic Xenoliths from the Stockdale Kimberlite, Riley County, Kansas”. Bulletin (Kansas Geological Survey), no. 199 (January): 1-12. https://doi.org/10.17161/kgsbulletin.no.i199.22224.