In connection with a paper recently prepared for the Iowa Geological Survey, entitled "Echinoderms of the Iowa Devonian," some interesting facts regarding the geographic distribution of the echinoderms of this system were ascertained. Forty-three species and two varieties constitute the total number studied. Of these four are cystids, four are blastoids, thirty are crinoids, and five are echinoids. The two varieties consist of one camerate crinoid and one echinoid. Seven of the species are known to occur in the Devonian of neighboring states.
Proceedings of the Iowa Academy of Science
©1923 Iowa Academy of Science, Inc.
Thomas, A. O.
"The Geographic Distribution of Iowa Devonian Echinoderms,"
Proceedings of the Iowa Academy of Science, 30(1), 463-465.
Available at: https://scholarworks.uni.edu/pias/vol30/iss1/75