Geochemistry of the Namaqualand, Bushmanland and Warmbad melilitite and kimberlite provinces of South Africa and Namibia: the southern extension of the African kimberlitic megalineament - Janney, P.E.; Kirchner, M.D.; Ogungbuyi, P.I.; Harris, C.; Bell, D.R. (International Kimberlite Conference: Extended Abstracts, 2017)