The McMordie Ranch and Hale Ranch fields produce from multiple stratigraphic traps representing several depositional environments. The fields, located in the southwestern Anadarko basin northeast of the Amarillo uplift, are traversed by the prominent northwest-southeast-trending Lips fault. Major down-to-the-northeast displacement along this fault during the Early Pennsylvanian affected deposition of the lower and middle Morrow. The McMordie Ranch field produces from multiple stratigraphic traps in the lower and upper Morrow, Cherokee granite wash, and Douglas sandstones on the downthrown side of the Lips fault. The producing lower Morrow sandstone, which occurs only on the downthrown side, reaches a maximum net-pay thickness of 34 ft (10.4 m). This sand facies appears to be a beach or offshore bar, 1 mi (1.6 km) wide and 2 mi (3.2 km) long, deposited parallel to a shoreline controlled by the Lips fault. In the upper Morrow, two distinct reservoir facies are recognized--point bars and stream mouth bars, which were deposited on a southeast-sloping delta plain. The lower Cherokee Group contains two productive granite wash sandstones, which were deposited near the distal north edge of a fan-delta complex sourced from the Amarillo Mountain uplift. The productive sections are each 8-14 ft (2.4-4.3 m) thick with variable porosity development. The shallowest reservoir in the field is the lower Douglas sandstone, an east-west-trending channel sandstone, 10-15 ft (3-4.5 m) thick and approximately 0.5 mi (0.8 km) wide.

The one-well Hale Ranch field produces from the Lower Mississippian Kinderhook sandstone in a fault block on the upthrown side of the Lips fault. This 16-ft (5-m) thick sandstone averaging 10% porosity is interpreted as a northwest-southeast-trending barrier bar encased in shale. Characteristically, this sand shows an excellent SP deflection, despite a high gamma-ray reading due to the thorium content in the sand.

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