365 The Oligocene of the Southern United States 55 



Section at Aspalaga Bluff. 



and the Chattahoochee limestone. The clays appear rather to be 

 merely argillaceous beds of the limestone, which becomes again 

 more calcareous above. 



A sedlion taken at the highest point of Aspalaga Bluff by Dr. 

 Dall gives a total thickne.ss of 75 feet above water level. Of this, 

 the lower 40 to 50 feet are referred to Chattahoochee limestone; 

 the succeeding 20 feet, to bluish green marl (Aspalaga clay of 

 Johnson) with Ostrea and Pe5len; 'the remaining five feet comprised 



