342 E. W. Hilgard—Geological Reconnoissance of Louisiana. 
The Cretaceous outliers, presently to be mentioned, furnish 
limestone containing only 1 to 15 per cent of impurities, and 
are sometimes chemically pure carbonate. 
The Satines of North Louisiana.—One of the most striking 
features of North Louisiana is the occurrence of salt springs 
gray granular gypsum of 12 to 20 inches thickness, frequently 
appears, and beneath this the brine is reached, in a sandy layer. 
way. This fact coupled with the lithological character of the 
latter (which is foreign to all the Tertiary groups known to 
ce 
appears independently farther south, in the shape of limesto 
ridges elevated perhaps a hundred feet above the draimage 
the country ; as near Winfield, and on Saline Bayou below — 
Drake’s Salt Works, Z 
It will be observed that the general trend of the body of 
these outliers is about S.E, and N.W. A continuation of this 
line strikes the main body of the Cretaceous of Arkansas, 
Hempstead county, on the one hand ; on the other, @ body of ‘ 
* Marcy’s Exploration of Red river, p. 195. 
