The goal of this study is to identify the US equivalents of Canadian stratigraphic units that host pervasive biogenic gas systems. This identification is accomplished by constructing a consistent stratigraphic model of the Upper Cretaceous section in a rectangular block encompassing Townships 31N to 37N (Canada-US border) and ranges 12E to 30E, but excluding Townships 31N and 32N, Ranges 12E through 18E over the Tiger Ridge. From this work, it would appear that the Alderson Member has the best potential where it occurs in the US. Judging from the appearance of the logs, it is very similar to the productive unit in Canada. Other prospective zones would be the Judith River Formation (Belly River equivalent), the Upper Carlile (Medicine Hat equivalent), and the Greenhorn (Second White Specks equivalent).