Geological Survey of Alabama. 11 



9. Heavy-bedded, gray, sandy clays, with streaks of brown colored 

 clays 8 ft. 



10. Reddish, sandy marl, highly fossiliferous, forming concretionary 

 bowlders. Remarkable for the great number of Venerieardia planicosta, 

 but containing also many other forms, such as Athleta Tuomeyi, Fusus 

 pagodiformis, etc 4 to 5 ft. 



11. Dark-gray to brown, sandy clays to water's edge. 15 ft. 



2. The Wood's Bluff or Bashi Section. SO to 85 feet in thickness. 

 The uppermost 30 feet of this section consist of dark-brown clays passing 

 into a green sand, which holds a great variety of finely-preserved marine 

 shells. Below this green-sand marl are gray, sandy clays, with four or 

 five thin beds of lignite within the first 25 feet, succeeded by about 30 

 feet of cross-bedded sands, with a two-feet seam of lignite at the base. 



The details of the most important fossiliferous beds of this section, 

 occurring at the typical locality, are given in the following : 



Section at Wood's Bluff. 



Orange sand or stratified drift ; surface 20ft. 



1. Dark-brown or bluish-black laminated clays, forming the lowermost 

 beds of the Hatchetigbee Section 10ft. 



2. Dark-bluish, sandy clays, turning red on exposed surface. This 

 bed is highly fossiliferous, containing Laevibuccinum striatum, Athleta 

 Tuomeyi, Fusus pagodiformis, and many other forms, some of which 

 seem to be confined to this horizon 3 to 4 ft. 



3. Bluish, laminated clay, or sandy clay, much like No. 2 in color and 

 texture, but containing no fossils, or very few, and not turning red on 

 exposed surface; of variable thickness 5 to 8 ft. 



4. Bluish or greenish sandy clay, somewhat indurated, of decidedly red- 

 dish color on surface; highly fossiliferous; characterized by Turritellas 

 and Dentalum microstriatum, but containing also Ancillaria staminea, 

 Pyrula multangulata, Corbula oniscus, Infundibulum trochiformis, etc. 

 The lower part of this bed passes gradually into the green-sand marl 

 No. 5, and is the best collecting ground, as the material is less indurated 

 and the shells more easily removed. Thickness 3 to 4 ft. 



5. Green-sand marl, 10 to 12 feet down to the water level. The upper 

 part of the marl is quite soft and friable, but just above the water's edge 

 it becomes indurated, forming rounded bowlderlike masses, This and the 

 preceding might together be considered as one, and called the lower marl. 



