Cross sections A-A' and B-B' show the stratigraphic framework of Upper Cretaceous rocks in part of the Piceance basin, northwestern Colorado. This Laramide basin is asymmetric in shape and has a gently dipping western flank and a steeply dipping eastern flank. The basin is bounded by the Uinta uplift to the northwest, the Douglas Creek arch to the west, the Axial Basin uplift to the north, the White River uplift to the east, the Gunnison uplift and the Sawatch-Elk range to the southeast, and the Uncompahgre uplift to the southwest.
