10 University of Texas Bulletin 



CORRELATION TABLE OF THE COMANCHEAN FORMATIONS OF CENTRAL TEXAS' 



is about 110 miles in Texas and 100 miles in Oklahoma. The outcrop is S- 

 shaped, and north and west of its limits in North Central Texas the forma- 

 tions are eroded away; while east and south of the outcrop, the Weno- 

 Pawpaw rock sheet continues underground for an unknown distance, being 

 buried beneath the more recent Comanchean and Cretaceous strata. This 

 concealed extension of these formations still awaits exploration by means 

 of detailed well logs and the examination of samples from drillings. The 

 formations show distinct north-south changes along their outcrops and 

 equally distinct east-west changes. As a whole, they thicken moderately 

 from the Brazos river (near Blum) north to the Red River (north of 

 Gainesville) , and thence eastward down the Red River valley through Den- 



'See also: Bose, University of Texas Bulletin, 1902, p. 16, fig. 1. 



2 The Comanchean sea was transgressive northwards over much of Central Texas, 

 and the Basement sand is not a single formation, but at different places is the time 

 equivalent of various off-shore formations. 



