Westrop, S.R.; Adrain, J.M. (2007). Bartonaspis new genus, a trilobite species complex from the base of the Upper Cambrian Sunwaptan Stage in North America. Canadian Journal of Earth Sciences, 44 (7), 987-1003
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Westrop, S.R.; Adrain, J.M.
2007
Bartonaspis new genus, a trilobite species complex from the base of the Upper Cambrian Sunwaptan Stage in North America.