Midwestern USA USA
Geological Time: Silurian Upper Silurian
the image is from a publication, which is cited in the table descriptions of the below cited book by
View of a specimen of Stomasphaera brassfieldensis Mound, 1961
The identification is based upon:
Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 21, Fig. 11