Western Canada and USA USA
Geological Time: Silurian
The identification is based upon:
McClellan, P., 1973: Siluro Devonian microfaunal biostratigraphy in Nevada. Bulletins of American Paleontology, 62 (274), 235-375. <a href="https://www.biodiversitylibrary.org/item/40445" target="_blank">Available online at the Biodiversity Heritage Library</a> <br>published by the Paleontological Research Institution, Ithaca, New York.<br> Plate 36, Fig. 8