The Pennsylvanian goniatite species Wiedeyoceras sanctijohanis (Wiedey) was described in 1929 on the basis of two specimens from Greene County, Iowa, collected by O. H. St. John about 1865. An additional lot of specimens representing this species has been secured from a locality only about four miles northwest of the original site. The new material serves to give a better understanding of this fossil and a basis for comparison with comparable specimens from Missouri and elsewhere.
Proceedings of the Iowa Academy of Science
©1966 Iowa Academy of Science, Inc.
Furnish, W. M. and Spinosa, Claude
"Historic Pennsylvanian Ammonoids From Iowa,"
Proceedings of the Iowa Academy of Science, 73(1), 253-259.
Available at: https://scholarworks.uni.edu/pias/vol73/iss1/36