Philip R. Bjork

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Philip Reese Bjork is an American geologist and paleontologist known for his work in unearthing dinosaur species in America.


Bjork received his undergraduate degree at the University of Michigan.[1] Bjork's Master's thesis was on the vertebrate fossils of the Slim Buttes.[2] He was a professor at the South Dakota School of Mines and Technology[1] in Rapid City, South Dakota, as well as serving as director of their Museum of Geology[3] from 1975 to 2000.[2] His academic focus was on Cretaceous dinosaurs and mammals from the Cretaceous and early Cenozoic.


Bjork described a fossil of Proscalops tertius, an extinct insectivoran, that he had found in Oligocene deposits in the Badlands National Park.[4]
He announced the find of remains of at least ten duck-billed dinosaurs in western South Dakota.[5]
Bjork reported the discovery of Dakotadon, originally believed to be the first remains of Iguanodon found in North America, in the Lakota Formation of South Dakota;[6] the remains included the skull, partial mandible, and incomplete caudal and dorsal vertebrae.[7][8]

Selected publications[edit]


  1. ^ a b SDSM&T 1998-99 Undergraduate and Graduate Catalog (PDF). South Dakota: South Dakota School of Mines and Technology. 1998. p. 316. Retrieved 2009-11-24. 
  2. ^ a b Macdonald, J. R.; Minkler, Heidi; Martin, James. "Museum of Geology History". South Dakota Museum of Geology. Retrieved 24 November 2009. 
  3. ^ Bowman, John Stewart (1986). The World Almanac of the American West. New York, NY: Ballantine Books. p. 355. ISBN 0-345-33720-4. 
  4. ^ Bjork, Philip R. (September 1975). "Observations on Proscalops tertius (Mammalia: Insectivora) of the Upper Oligocene of South Dakota". Journal of Paleontology. SEPM Society for Sedimentary Geology. 49: 808–813. ISSN 0022-3360. JSTOR 1303274. 
  5. ^ "Dinosaur Remains Found in S. Dakota". San Jose Mercury News. August 30, 1985. pp. 13A. Retrieved 24 November 2009. 
  6. ^ Weishampel, David B.; Bjork, Philip R. (March 30, 1989). "The First Indisputable Remains of Iguanodon (Ornithischia: Ornithopoda) from North America: Iguanodon lakotaensis, sp. nov.". Journal of Vertebrate Paleontology. Society of Vertebrate Paleontology. 9 (1): 56–66. doi:10.1080/02724634.1989.10011738. ISSN 0272-4634. JSTOR 4523237. 
  7. ^ Weishampel, David B.; Osmólska, Halszka; Dodson, Peter (2004). The Dinosauria. Berkeley: University of California Press. p. 416. ISBN 978-0-520-24209-8. Retrieved 2009-11-24. 
  8. ^ Tanke, Darren H.; Carpenter, Kenneth; Skrepnick, Michael William (2001). Mesozoic Vertebrate Life. Bloomington: Indiana University Press. p. 185. ISBN 978-0-253-33907-2. Retrieved 2009-11-24.