New Basal Iguanodonts from the Cedar Mountain Formation of Utah and the Evolution of Thumb-Spiked Dinosaurs McDonald, Andrew T. ; Kirkland, James I. ; DeBlieux, Donald D. ; Madsen, Scott K. ; Cavin, Jennifer ; Milner, Andrew R. C. ; Panzarin, Lukas Abstract Publication: PLoS ONE Pub Date: November 2010 DOI: 10.1371/journal.pone.0014075 Bibcode: 2010PLoSO...514075M