GRETAGE0U8 FORMATION. 89 



Section at Chalk Bluff, Elmore Count)/. 



1. Layette red loam and pebbles 15 feet 



2. Gray and yellow sandy clays, In distinct but 



irregular layers 6 " 



8. White clay, 3 feet graduating downwards Into 



yellow ochreous clay, 3 feet C- " 



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

 ingly tough and sticljy ; full of vegetable 

 remains, flattened and bituminlzed 10 " 



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

 been tested and analyzed by Dr. Ries (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 to be wondered at, since ike 

 stratification is very irregular, and no two sections, 

 twenty feet apart, are idential. 



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

 gua, and on most of the public 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 ithe 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, Yineton. 



1. Stratified clays of white, pink, and purple 



colors, interlamlnated 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 



