T. H. Aldrioh — Tertiary of Alabama. 



301 



observations made by a careful writer, the Rev. C. S. Hale ;* 

 on page 359 of that article he states that the Claiborne sand 

 -(No. 7) appears at low water at a point four miles south; the 

 bottom of the bed at the Claiborne bluff is about 90 feet above 

 low water; this shows a southerly dip of at least 22 feet per 

 mile. The true dip is more than this, as the river runs W.S.W. 

 between these places. 



The following section with the above explanation will give 

 a clear view of the vicinity of Claiborne. 



Section from the river through Claiborne to Perdue Hill. 

 (a.)=limy spots. 



South of Claiborne where the road crosses Randon's Creek, I 

 found fine specimens of Pecten Poulsoni Mort., Orbiloides Man- 

 ■telli Con., a species of Echinus and several casts of other shells. 

 All these species are also found at Perdue Hill. 



The section of Claiborne bluff following shows (No. 9 and 

 10) strata not given by Dr. Meyer, probably owing to a higher 

 stage of water at the time of his visit. There is otherwise no 

 material difference. The measurements were made at the 

 lower landing with the exception of the two lowest beds which 

 rise up at the upper landing and above (another proof of a 

 southerly dip). 



I wish here to correct an error which seems to be made by 

 nearly every writer who has given a profile of the bluff at 

 Claiborne, f and that is the designation of the lower part of the 

 Claiborne section as limestone. It is a calcareous clay and not 

 limestone, the average proportion of lime being about 12 per 

 cent,;}: and Winchell's statement that this bed has not been 

 recognized elsewhere is also erroneous, as shown further on. 



Beds Nos. 9 and 10 are particularly interesting from the fact 



* Geology of South Alabama, by C. S. Hale, this Journal, II, vol. vi, pp. 354- 

 363. 1848. 



f Conrad. J. A. tf. S., 1st Series, vol. vii, p. 122. 1834. "Wiachell, P. A. A. S., 

 1856, Part I, p. 86. Tuomey, 1st Bien. Rept., 1850, p. 152. 



% Lea, Contrib. to G-eol., 1833, p. 22. Mell, Tr. Am. Inst. M. Engrs., 1880. 



