Locality map, San Juan Basin, New Mexico, southwest USA. Stratigraphic position of Ziapelta sanjuanensis, gen. et sp. nov., in the De-na-zin Member, Kirtland Formation, and comparison with the stratigraphic positions of other ankylosaurids in New Mexico and Alberta. Alberta stratigraphic column modified from Eberth and Braman. Dates with asterisks represented revised dates from Roberts et al..