Ichnotaxonomic Review of Large Ornithopod Dinosaur Tracks: Temporal and Geographic Implications Díaz-Martínez, Ignacio ; Pereda-Suberbiola, Xabier ; Pérez-Lorente, Félix ; Canudo, José Ignacio Abstract Publication: PLoS ONE Pub Date: February 2015 DOI: 10.1371/journal.pone.0115477 Bibcode: 2015PLoSO..1015477D