Record of Geology of Texas, ISS'Z-ISQG. 
185 
Kennedy^ W. 
3. iBasal Clays, or Wills Poiiifc 
Clay 260 feet. 
1810 feet. 
V. Gretaceous, found in wells at Grand 
'Saline 357 feet. 
Pp. 44-45. 
375. 
Report on Grimes, Brazos, and Robertson Gonnties. 
Fourth Ann. Rept. of the Geol. Surv. of Texasi, 1892, Pt. I, 
pp. 3-84. 3 maps'; 2 plates of sections. Austin, 1893. 
Contents: Chapter I. Grimes 'County. Geography and Topography. 
Prairies. General Geology — ^(1) Recent. (2) Quaternary. Navasota 
Beds, (a) Upper Division, (b) Dower Division. Eocene. Piedmont 
Springs Area. Economic Geology — ^Soils. Alluvial Soil. Residual Soils. 
1. The Grayish B'rown and Dark iColored Calcareous Soils. 2. Gray 
Upland Sandy Soils. 3. Black Calcareous Soils. Wallace Prairie. 
Grimes Prairie. Navasiota Prairie. Fuqua Prairie. Roan Prairie. An- 
derson Prairie. 4. Gray Sands of the Piedmont Springs Area. Building 
Stones. 1. Hard Semi-Quartzitie and Close-Grained Sandsitones. 2. The 
Soft Thinly Bedded Calcareous Sandstones. 3. Upper Havasota Sand- 
stones. Clay. Abrasive Materials. Lignite and Brown Coal. Timber. 
Water Supply. Artesian Water.’ Mineral Springs. 
Chapter II. Brazos County. Geography and Topography. General 
Geology — ^Recent. Quaternary. Havasota Beds. Eocene. 1. Gray Sand- 
stones. 2. Thinly Bedded Gray and Dark Gray Sandy Clays, Laminated 
and Thinly Bedded Sands and Clays, with Thin Beds of Lignite and Gyp- 
seous Clays. 3. Brown Ferruginous GreensAnd Marls, Greensands, and 
Greenish Blue Clays. Economic Geology — Soils. Alluvial. Residual Soils. 
Building Stones. Clays. Brown Coal. Timber. Water Supply. Artesian 
Wells. Navigable Streams. Mineral Springs. 
Chapter III. Robertson Couiiity. Geography and Topography. General 
'Geology — Recent. Quaternary. (1) Lower Deposits. (2) Upper Divis- 
ion. Tertiary. Basal Beds. Lignitic Beds. Marine Beds. Economic 
Geology — ^So'ils. Building Stones. Clays. Brown Coal. Timber. Water 
Supply. Mineral Springs. 
276. 
Texas Clays and their Origin. 
Science, Yol. xxii, pp. 297-300. Dec. 1, 1893. 
Analyses of the clays of the Texas Tertiaries show that in most instances 
the soda to exceed the potash in ratios of 2 to 5 of soda to 1 of potash. 
“As this excess varies in the different divisions, the difference gen- 
erally increasing as we ascend in the beds, 'While at the same time the 
actual quantities' of both decrease in the same ratio until the highest or 
coastal clays are reached, when the amounts of both are largely increased. 
