Schafersman, S. D. (1978): Radiolarian phylogeny and biohorizons in tropical Cenozoic biostratigraphy. Geological Society of America (GSA), Boulder, CO, United States, The Geological Association of Canada, The Mineralogical Association of Canada, The Geological Society of America (91st annual meeting); 1978 joint annual meeting, 10 (7), 485, georefid:1979-011278