Zygospira modesta

Zygospira modesta

Source: Pope, J.K and W.D. Martin. 1979. Field Guidebook to the Biostratigraphy and Paleoenvironments of the Cincinnatian Series of Southeastern Indiana. Seventh Annual Field Conference of the Great Lakes Section, Society of Economica Paleontologists and Mineralogists. Miami University Audio Visual Service: Oxford, Ohio.