Description: The North Lyons thickness contours were digitized from a map that was published by Levandowski and others (1973).
Copyright Text: Levandowski, D., Kaley, M., and Smalley, R., 1973, Cementation in the Lyons Sandstone and its role in oil accumulation, Denver Basin, Colorado: American Association of Petroleum Geologists Bulletin, v. 57, no. 11, p. 2217–2244.