CRETACEOUS FORMATION. 89 



Section at Chalk Bluff, Elmore County. 



1. Layette red loam and pebbles 15 feet 



2. Gray and yellow sandy clays, in distinct but 



irregular layers 6 " 



3. White clay, 3 feet graduating downwards into 



yellow ochreous clay, 3 feet i " 



4. Gray plastic clay blue when wet, and exceed- 



ingly tough and sticky ; full of vegetable 

 remains, flattened and bituminized 10 " 



Two samples of this clay (Nos. 101 and 122) have 

 been tested and analyzed by Dr. Kies (see below un- 

 der the head of Pottery Clays and Brick Clays) , where 

 a section of this bluff is given, differing slightly from 

 the above. This is not bo be wondered at, since 'the 

 stratification is very irregular, and no two sections, 

 twenty feet apart, are idential. 



Along the line of the Mobile and Ohio Ky., in Auta- 

 gua, and on most of the pubilc roads leading from 

 Prattville north and northwest, there are exposures of 

 Tuscaloosa strata, consisting of sands and clays, the 

 former predominating. In the western or northwest- 

 ern part of the county, near Vineton, many instruc- 

 tive sections of the Tuscaloosa beds are to be seen. 

 Some of these sections include beds of clay, which are 

 of interest in our present work. 



Section, near Col. J. W. Lapsley's place, Vineton. 



1. Stratified clays of white, pink, and purple 



colors, interlaminated with thin sheets of 

 yellow sands : the lower part of this bed has 

 a larger proportion of sand 10% feet 



2. Gray laminated clay with partings of purple 



sands 5 " 



3. Yellowish white laminated clays, with purple 



and other bright colors on the dividing 

 planes, 5 feet showing, but the same beds 

 appear to continue down the hill for at least 

 ten feet further 15 " 



