history of geology, anthropology, and evolutionary thought
past and present research includes
studies of rock-boring marine invertebrates in the intertidal zone of the Gulf of California in Sonora, Mexico;
studies of Neogene fossil fishes from western North America.
anatomy and systematics of salmonid fishes;
-analysis of fish remains from archaeological sites in New Mexico and west Michigan;
and assisting in developing a computerized database of Pleistocene mammalian fossil sites for North America
directed the excavation of the Ada Bible Church Mastodon in Cascade, Michigan