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Journal Article THE EVOLUTION OF A PERMIAN VERTEBRATE CHRONOFAUNA Get access Everett C. Olson Everett C. Olson University of Chicago Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 6, Issue 2, 1 June 1952, Pages 181–196, https://doi.org/10.1111/j.1558-5646.1952.tb01413.x Published: 01 June 1952 Article history Received: 14 December 1951 Published: 01 June 1952
Everett C. Olson (Sun,) studied this question.