Berkey C.P. (1898). Geology of the St. Croix Dalles, III: Paleontology. <em>The American Geologist.</em> 21: 270-294. page(s): 285, pl. 19, Figs. 19, 20 [details]
original descriptionBerkey C.P. (1898). Geology of the St. Croix Dalles, III: Paleontology. <em>The American Geologist.</em> 21: 270-294. page(s): 285, pl. 19, Figs. 19, 20 [details]
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