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REPORT OF MR. W. KENNEDY.

INTRODUCTION.

The work of the Survey in East Texas during the season of 1891 was chiefly the determination of the different geological horizons found within that area. The examination of some of the lignite deposits of Wood county and a complete detailed examination and survey of Houston county were also made during the season.

For the purpose of locating the contacts and positions of the different geological horizons found within this portion of the State detailed sections extending from the Cretaceous marls in Kaufman county to the coast were made. The main line of sections, which commences at the contact between the Cretaceous marls and the base of the Tertiary, about three miles east of Terrell, Kaufman county, passes across the eastern portion of the State, in a generally south-easterly direction, ending at Sabine Pass, a distance of nearly 300 miles

Another section was made across the lower portion of Anderson county, through Houston county and ending at the Trinity river in Trinity county.

The main lines of the railways extending in easterly, south-easterly and southerly directions were used as the basis of these sections, but with the view of obtaining as accurate information as possible relative to the lay of the different deposits, as well as their comparative elevations and maximum thicknesses, zigzag lines, sometimes several miles in length, were drawn diagonally across the main line of levels.

The railway profiles used were: 1st. That of the Texas and Pacific from Terrell to Mineola, a distance of 46 miles. 2nd. The International and Great Northern Railway from Mineola to Tyler, 25 miles. 3rd. The Tyler Southeastern from Tyler to Lufkin, 90 miles. The scale of this profile was so small that considerable leveling had to be done by the Survey. 4th. The Houston, East and West Texas Railway from Lufkin to Corrigan, 24 miles 5th. The Trinity and Sabine Railway from Corrigan to Colmesniel, 29 miles. 6th. The Southern Pacific Railway from Rockland to Sabine Pass, a distance of 103 miles.

In the shorter line across Houston county the levels used were altogether those of the International and Great Northern Railway.

The levels used on these lines are all based upon the average tide level of the Gulf of Mexico at Galveston, and may therefore be taken as accurate. The levels obtained by the Survey are partly instrumental and partly from barometric readings, and may be considered reasonably accurate.