Northwest Quinlan and Cedardale fields in eastern Woodward and western Major Counties, Oklahoma, are located on the northern shelf of the Anadarko basin. Both fields produce gas from stratigraphic traps in the Mississippian Chester Limestone. Production at Cedardale is primarily from the Pennsylvanian Cottage Grove Sandstone.

Traps in the Chester were formed by lateral changes in the original limestone deposition and cementation. Original porosity and permeability were later altered by subaerial leaching which preceded the deposition of the overlying Pennsylvanian sediments.

The trap in the Cottage Grove Sandstone was formed by an updip facies change from sandstone to shale on the gently sloping shelf.

Cedardale was discovered in 1957 and Northwest Quinlan in 1958. Production has been established in 55 sections and development drilling is continuing with the limits of these fields still not defined.

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