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by the black sands containing gypsum found in the wells in the neighborhood of Forest and Baker's switch.

Fourth. A formation, consisting of gray and brown sands and sandstones, ferruginous gravels and ferruginous pebbles, conglomerate iron ore and gray sandstones, occurs almost everywhere, either in extensive sheets or in scattered patches, and in thicknesses varying from a few inches to ten or more feet. The gravels of this formation are deposited extremely irregularly, and appear in connection with the brown overlying sands in the form of irregular pockets and thin contorted strata, having no continuous length, and usually not more than a few inches thick, although in places thickening to two or three feet. This formation has no uniform location, but overlies the whole of the other divisions to a greater or less degree, and in places it has been entirely eroded. It may approximately be correlated with the Columbia formation of McGee.

4. SECTION FROM THE ANGELINA RIVER, IN ANGELINA COUNTY,
SOUTH. TO CORRIGAN STATION, IN POLK COUNTY, ALONG THE
LINE OF THE HOUSTON EAST AND WEST TEXAS RAILWAY.

A wide bottom lies along the south side of this portion of the Angelina river, and the section across it discloses nothing but a series of sands and silts common to the flood plains of every river or large stream in this portion of the State. Going south, the first section seen is near mile post 123, where a stream cut on the side of the road gives the section of:

A little over one mile south a somewhat similar section is seen on the railway. In this cut the gypseous clays noticed in the last section are four feet thick, and dip south 10 degrees west 5 degrees, and the overlying material is chiefly made up of ferruginous gravel and sand.

From this point southward, through the town of Lufkin, and as far south as Burke, the country is flat and covered with a white sand containing occasional small pockets of siliceous gravel, fossil wood and nodules of calcareous material.

From the records of the few wells dug or bored in this region the area is underlaid by a blue gypseous clay, with occasional streaks or pieces of lignite. The water found in the wells is saline and unfit for use, and the lignite found generally occurs in the form of rounded nodules.

A small prairie in the neighborhood of Burke is covered with the same gray sand showing saline spots throughout the area of the prairie. The beds underlying the prairie are thinly stratified blue clays containing