Although Red river is one of the most important of the western rivers, its adjacent territory has not been thoroughly explored or surveyed. In 1852 Marcy’s expedition reached the river at Preston, near the western border of the region discussed in this paper, and proceeded from thence westward to the headwaters of the stream. Its lower portion, east of the Texas-Louisiana line, has been reported upon by various engineers as to its navigability. The medial portion between these points has not been seriously studied, and little has been written upon the geology of the adjoining country. La Salle, De Soto and other early pioneers crossed this portion of the river previous to the present century. Here Nuttall botanized, and Catlin painted some of his most interesting portraits of Indian life.
The only early pioneer geologists who touched the area were Dr G. G. Shumard . . .