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Albany to Haskell. At that locality we found the contact between the two formations. From thence we traveled almost west to the Double Mountains, in the western edge of Stonewall County. From there we went south to Sweetwater, on the line of the Texas and Pacific Railroad, passing through the town of Fisher, sending the balance of the party back to Albany. From Albany we ran a line of levels on a northwest line to Kiowa Peak, in the northeast corner of Stonewall County. From thence we went west to the edge of Kent County. Thence southwestward to the Salt Fork of the Brazos River, and carried the line to the mouth of White River. Thence up that river to the edge of Floyd County.
Mr. N. F. Drake had charge of the topographic work on this trip, and has proven himself quite efficient in his work, the results of which will be published in a later report.
The difference of present altitude above sea level between the lowest and highest beds of the Permian, as determined by this Survey, is 916 feet. This would be on a line from Clear Fork of the Brazos, near the line of Shackelford County, to Dockum, in the western edge of Dickens County.
W. F. CUMMINS,
Geologist.
REPORT OF MR. R. T. HILL.
Austin, Texas,
March 31, 1890.
Mr. E. T. Dumble, State Geologist:
DEAR SIR—
In accordance with your request upon organization of the Survey, I undertook, in February, 1889, in co-operation with my duties as instructor in the University of Texas, the study of the natural features of those portions of the State known as the Black and Grand Prairie regions and the accompanying Upper and Lower Cross Timbers, all of which are the surface features of the Cretaceous rocks, to which they owe their topographic individuality, economic possibilities, and conditions for human habitation.
The work was originally taken up with the hope of bringing the instruction given my classes into closer contact with the practical side of Geology by the utilization of the students in the field and training them for positions upon the Survey; but this was found to be impracticable, and you gave me the assistance of the young men whose names and service are mentioned more fully in the accompanying pages, by whose faithful and painstaking labor much has been accomplished. In the month of July I received an appointment as Assistant Geologist upon the United States Geological Survey,