This report gives information about the geography, geology, and ground-water resources of an area of nearly 4,000 square miles located in southwestern Arkansas, with particular reference to deposits of Cretaceous age. Records of 397 wells and chemical analyses of water from 328 wells are listed.

The report also includes:

• Maps giving well locations, the outcrop areas of and quality of water in the Tokio formation and the Nacatoch sand, the outcrop area for the Trinity group and location of wells tapping the Trinity, Woodbine formation, Brownstown marl, Ozan formation, Wilcox formation, and deposits of Quaternary age
• Table showing generalized geologic column of sedimentary units in the study area
• Graphs from pumping tests on several water-bearing units
• Discussions of the yield and water quality of water in each Cretaceous formation
• Formation outcrop and subsurface maps for each of the Cretaceous formations

*Includes: 53 pages, 8 figures, 6 plates, 12 tables

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