Earliest Animal Footprints Ever Found -- Discovered in Nevada (2 of 2) (image) Ohio State University Share Print E-Mail Caption Pictured below is the trackway of one of the earliest animals, a multilegged creature that walked over the bed of an ancient sea once covering Nevada. The animal left behind a pair of parallel impressions -- small, round dots in the silt that later became rock. Credit Photos by Kevin Fitzsimons, Ohio State University. Usage Restrictions News media use only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.