Adult, Juvenile, and Infant, Iowa Tarkio Valley Giant Ground Sloth. Megalonyx jeffersonii (Desmarest, 1822)Holmes A Semken
Specimens exposed during 1993 flood. Discovered in creek bed by Bob and Sonia Athen in 2001. Tiemann specimens recovered from under cut bank. Athen specimens in creek bed or under south bank. Specimens from this site include: Megalonyx jeffersoni 101037 (adult), 102849 (juvenile), 130544 (infant), and Paramylodon harlani 116925.
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