Traits taxon details
original description
Weaver, C. E. (1912). A preliminary report on the Tertiary paleontology of Western Washington. <em>Washington Geological Survey Bulletin.</em> 15: 1-80, 15 pls. page(s): p. 73, pl. 11, figs 83, 84. [details] 
additional source
Clark, B. L. (1918). The San Lorenzo Series of middle California. A stratigraphic and palaeontologic study of the San Lorenzo Oligocene series of the general region of Mount Diablo, California. <em>University of California Publications, Bulletin of the Department of Geological Sciences.</em> 11(2): 45-234, pls. 3-24., available online at https://www.biodiversitylibrary.org/page/43342287 page(s): p. 171. [details]
additional source
Merriam, C. W. (1941). Fossil Turritellas from the Pacific Coast Region of North America. <em>University of California Publications. Bulletin of the Department of Geological Sciences.</em> Volume 26, No. 1, pp. 1-214, plates 1-41; 19 figures in text, 1 map., available online at https://babel.hathitrust.org/cgi/pt?id=uc1.31822023465453;view=1up;seq=9 page(s): p. 102-103, pl. 20, figs 10-16. [details]
additional source
Hickman, C. S. (1980). Paleogene marine gastropods of the Keasey Formation in Oregon. <em>Bulletins of American Paleontology.</em> 78(310): 1-112, 10 pls., available online at https://www.biodiversitylibrary.org/page/10693143 [details]
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