76

Going down the creek, another section, 100 yards farther south, shows:

Five hundred yards further south another section on the same creek shows:

Throughout this region fossils occur in the different wells bored or dug to the depth of 30 to 50 feet.

ECONOMIC GEOLOGY.

SOILS.

The soils in Robertson county may all be considered as fit for cultivation, although poor in many portions. They belong to the two great divisions—the alluvial or sedimentary, and the residuary or sedentary, of which the alluvial, although ranking only as second in point of extent, is the more important—and may be subdivided as follows:

First.—Alluvial, constituting the soils found throughout the Brazos river valley, on the western side of the county, and the bottom lands of the Navasota river, on the east, and connected with several of the larger creeks.

These lands are estimated by Loughridge to include about one-fourth of all the soils under cultivation in the county. They lie principally in the area between the two Brazos rivers. The soil is an alluvial loam from two to ten feet deep, varying from a gray sandy to a red and black waxey, and the subsoil is frequently sandy and sometimes clayey, of a red brown color, and extends to a depth of over 30 feet, where it rests upon a bed of white rounded pebbles of quartz and other gravel. Where these soils are sandy the tillage is easy, but when the soil is clayey or waxey, difficult in wet seasons. They are well drained and equally well adapted to cotton and corn.

These soils belong to the Brazos river lands, which are considered the best and most valuable in the State. An analysis from Dr. McLendon's farm shows: