QEOLOQICAL SURVEY OF TEXAS. 



Progress Table 



TABLE OF 



the geologic formations found in Texa 



System (Period). 



QUATERNARY. 

 TERTIARY. 



CRETACEOUS. 



JURA-TRIAS. 



PERMIAN. 



CARBONIFEROUS. 



DEVONIAN. 

 UPPER SILURIAN? 



SILURIAN. 





Katemcy. 



CAMBRIAN. 



Riley. 





Hickory. 



TEXAN. | 



Packsaddle. 



Llano. 



Mason. 





Click. 



FERNANDAN. 



Iron Mountain. 





Yalley Spring. 



BURNETAN. \ 



Bodeville. 

 Long Mountain. 

 Lone G-rove. 



Series (Epoch). 



Upper, or Black Prairie. 



Lower, or Comanche. 



Coal Measures. 

 Lower Carboniferous ? 



San Saba. 

 Leon. 



Division (Age). 



Coast Clays. 



Fayette [Blanco Canyon?). 

 Timber Belt, or Sabine River. 

 Basal 



Glauconitic. 



Ponderosa Marls. 



Austin Chalk. 



Eagle Ford Shales. 



Lower Cross Timber Sands. 



Washita. 



Fredericksburg. 



Trinity. 



Dockum f 



Double Mountain. 

 Clear Fork. 

 Wichita. 



Coleman- Albany. 

 Waldrip- Cisco. 

 Brownwood- Canyon. 

 Milburn- Strawn. 

 Richland- Gordon. 

 Bend. 



Creek. 

 Hinton. 



Hoover. 

 Wyo. 



Beaver. 



j Bluff. 

 1 Cavern. 



Potsdam Limestone. 

 Potsdam Flags. 

 Potsdam Sandstone. 



Sands, Clays, and 

 Sands, Clays, Gree 

 Clays. 



Glauconite Sands. 



Clays. 



Chalk and Limesto 



Clays. 



Sands. 



Limestones. 

 Limestones. 

 Sands. 



Sandstone and Con 



Clays, Sandstone, < 

 Limestone, Clay, S 

 Clays, Sands, and I 



Clays, Sands. 

 Limestone, Clays, 

 Limestones. 

 Clays, Coal, Limes- 

 Sandstone. 

 Limestone and Shf 



Dolomites and Che 

 Dolomites, etc. 



ites. 



Burnet Marble. 

 Brown Dolomit 

 Siliceous Magnesia 

 Sandy Shaly Dolor 



Limestone and Cal 

 Shales. 

 White and red Sar 

 Chocolate Limesto 

 Calcareous Sandst< 

 Sandy Shales. 

 Massive Sandstom 

 Coarse Conglomerc 



Marbles and Shaly 

 Quartzites and Sar 

 Sandy Shales and 



Calcareous Rock. 

 Chloritic slates an< 

 Carbonaceous Schi 

 Ferruginous Beds. 

 Quartzite. 

 Acidic Schist. 

 Basic Schist. 



Mica and Chlorite 

 Hornblende and P 

 Granite, Gneiss, et 



