Digital boundaries of the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to Canton Lake in northwestern Oklahoma

The aquifer boundaries established in a ground-water flow model for the aquifer include areas: 1) where the terrace deposits pinch out against relatively impermeable Permian-age formations; 2) where the alluvium has been deposited against relatively impermeable Permian-age formations; 3) where the alluvial and terrace deposits have been eroded and underlying Permian-age formations are exposed at the surface; 4) where the aquifer extends beyond the geographic limit of the study area; and 5) where the aquifer has little or no saturated thickness.

The lines in the data set representing aquifer boundaries along geological contacts were extracted from a published digital surficial geology data set based on a scale of 1:250,000. The geographic limits of the aquifer and areas of little or no saturated thickness were digitized from a folded paper map, at a scale of 1:250,000 from a ground-water modeling report.