An abundance of plant fossils from the Pennsylvanian period was found in sandstone caves near the Des Moines River in Marion County, Iowa, south of Pella. Fourteen species are listed in this preliminary report.
Proceedings of the Iowa Academy of Science
©1961 Iowa Academy of Science, Inc.
Huffman, M. D. and Henkel, Charles
"Fossil Plants From Cave Deposits Near Pella, Marion County, lowa,"
Proceedings of the Iowa Academy of Science, 68(1), 167-169.
Available at: https://scholarworks.uni.edu/pias/vol68/iss1/27