During the past year several very interesting proboscidian bones have been found in the Pleistocene deposits of Iowa. The first of these is the skull of a mastodon unearthed at some depth in an excavation near Red Oak. The mandible and tusks are lacking and the brain case has been broken away posteriorly. The face is well preserved and shows clearly the sutures, the various foramina, the anterior nares, the high forehead, and the great alveoli for the massive tusks. A well preserved molar is in place in each half jaw. The damaged condition posteriorly reveals unusually well the cancellated bony structure or diploë characteristic of proboscidian skulls. From tip of alveoli to top of skull the face measures 36 inches and the width of the face between the eyes 20.5 inches.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Thomas, A. O.
"Proboscidian Remains from Red Oak and Ottumwa, Iowa,"
Proceedings of the Iowa Academy of Science, 33(1), 222-223.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/48