Stratigraphy of North Park and Middle Park is contrasted to that of South Park for clarification of tectonic and structural differences. These differences may have had profound influence upon the accumulation of hydrocarbons.

Sediments of the North Park basin are analyzed because significant changes take place within short distances in potential reservoir rocks. Unconformable relationships exist to a profound extent in Tertiary and Upper Cretaceous rocks and their importance to accumulation of oil may be significant.

Petroleum development in the area has been sporadic and at times as spectacular as it has been disappointing. Development indicates that carbon dioxide gas in one part of a basin does not necessarily condemn other portions. Significant discoveries may yet be made in this and similar intermountain basins because factors of stratigraphy and structure are favorable.

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