INTRODUCTION. 



Sumnjary of tlje Lithological and Stratigrapljical Features and 

 Subdivisions of the Tertiary of Alabama, 



In the Report of the Geological Survey of Alabama for the years 

 1883-'4, these relations of the Tertiary Formation are described in detail 

 and fully illustrated by plates of sections and a map. From this report 

 the following summary is taken. 



THICKNESS. 



The whole thickness of the strata of the Tertiary Formation of 

 Alabama, occurring in the vicinity of the two rivers, is between 1620 and 

 1700 feet. This estimate is based upon actual measurements, except at 

 one or two horizons, and even in these places we are able to give close 

 estimates of the thickness of the strata not measured. 



SUBDIVISIONS. 



We have adopted a fourfold division of the Tertiary, which, in de- 

 scending order, is the following : 



1. The White Limestone, 



2. The Claiborne, 



3. The Buhrstone and 



4. The Lignitic. 



In all that follows the strata are described in descending order. 

 1. The White Limestone. This subdivision is calcareous throughout, 

 but the lowermost 60 feet are more argillaceous than the rest. The 



