Western Canada and USA USA
Geological Time: Silurian
View of a specimen of Stomasphaera brassfieldensis Mound, 1961
The identification is based upon:
McClellan, P., 1973: Siluro Devonian microfaunal biostratigraphy in Nevada. Bulletins of American Paleontology, 62 (274), 235-375. Available online at the Biodiversity Heritage Library
published by the Paleontological Research Institution, Ithaca, New York.
Plate 36, Fig. 7