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Physiographic provinces. The area here considered is a part of the interior plains of the United States, which is an extensive region of relatively slight relief and nearly horizontal beds of rock that is divided between the Great Plains province, its western part, and the Central Lowland, its eastern part. The boundary between these two physiographic provinces runs in general southward and lies not far from the one hundredth meridian the meridian that forms the eastern boundary of the Texas " panhandle." The most obvious difference between the Great Plains and the Central Lowland is one of altitude, for the plains are generally about 2,000 feet above sea level near their eastern edge and increase in height toward the west, whereas the lowland is everywhere below 2,000 feet. The boundary line between the provinces throughout most of its extent is drawn at the foot of an escarpment, or at least at the foot of an eastward slope, which is steeper than the average slope from the Eocky Mountains to Mississippi Eiver. At some places it is clear that the lowland is expanding westward by continued erosion and that the escarpment which separates the plains and the lowland is retreating westward, and it is therefore evident that the lower surface of that part of the Central Lowland has been produced by the wearing down of the Great Plains, which formerly extended farther east. Both the Great Plains and the Central Lowland may be divided into sections that differ somewhat in topography. Those represented in this area are the High Plains section of the Great Plains and the Osage section of the Central Lowland. High Plains section of the Great Plains. The High Plains are remnants of a once continuous plain whose surface was formed of Tertiary silt, sand, and gravel. This plain stretched from the Rocky

Physiographic provinces and sections in western Oklahoma and adjacent parts of Texas