A significant positive association was found between Nodosauridae and marine depositional environments (p=0.005); by contrast, their sister-clade Ankylosauridae are positively associated with terrestrial environments (p=0.05). The overrepresentation of nodosaurid specimens in marine environments suggests that they occupied a broader environmental range, including coastal areas, than did ankylosaurids (Coombs and Dem�r�, 1996). Hadrosaurids are overrepresented relative to other herbivores in marine environments (p=0.001), consistent with suggestions that they preferred coastal plain environments. However, existing evidence does not support the hypothesis that hadrosaurine hadrosaurs were more abundant in marine sediments than lambeosaurines (Horner, 1979). Both ceratopsians and pachycephalosaurs show positive associations (p=0.005) with terrestrial environments, supporting interpretations of inland environmental preferences. Our results provide quantitative support for previous qualitative hypotheses of palaeoenvironmental preferences, emphasising the potential of large databases in broad palaeoecological analyses.