Named after Reginald Walter Brock (1874-1935), a Canadian geologist. He held a number of high ranking posts in the field of geology until 1914. During World War I, he joined the Seaforth Highlanders of Canada (72nd Battalion, CEF). By 1915, he had attained the rank of major. Shortly after the war, he resumed his seat as dean of the Faculty of Applied Science at the University of British Columbia. He and his wife died in an airplane crash at Alta Lake, B.C. The name was submitted in 1965 by the Research Council of Alberta, and is one of a series of features in the area named after prominent geologists.

Approximately 336 km north of Fort McMurray.