Figure 50.

Taxonomic comparison of the two best-sampled squamate assemblages from the late Campanian of Laramidia. (A) Geographic distribution of published squamate occurrences in 11 penecontemporaneous depositional basins in the late Campanian of western North America, with modern political boundaries overlain. Modified from Sampson et al. [43]. Data reported from following references, listed by corresponding geologic unit, from north to south: Wapiti [30,102]; Oldman /Dinosaur Park [7,31]; Two Medicine [8,30,103]; Judith River [7,37]; Mesaverde [38]; Williams Fork [104]; Kaiparowits [32,41] (this study); Fruitland/Kirtland [36]; Aguja [34]; Cerro del Pueblo [39]; El Gallo [41]. (B) Published named taxa from the Oldman/Dinosaur Park formations in southeastern Alberta. (C) Published named taxa from the Kaiparowits Formation in southern Utah. Taxa in green boxes indicate probable endemic taxa, while taxa in blue boxes indicate taxa present in other geologic units. Silhouettes of lizard taxa modified from publicly available images of closest related modern squamate relatives at Phylopic.org. Body size of each taxon is a rough estimate based on published figures of described specimens. Asterisk next to Palaeosaniwa canadensis indicates uncertainty of affinity of material referred to the taxon.