image: Mark Clementz, assistant professor in the Department of Geology and Geophysics at the University of Wyoming, samples tooth enamel from molars in the lower jaw of a Florida manatee (Trichechus manatus latriostris). This image relates to an article that appeared in the April 22, 2011, issue of Science, published by AAAS. The study, by Mark Clementz, at University of Wyoming in Laramie, Wyo., and J.O. Sewall at Kutztown University in Kutztown, Pa., was titled, "Latitudinal Gradients in Greenhouse Seawater Delta18O: Evidence from Eocene Sirenian Tooth Enamel." view more
Credit: Image courtesy of University of Wyoming Photo Service