1881.] NATURAL SCIENCES OF PHILADELPHIA. 447 



rock (= London Clay).^ In either case they would be near the 

 base of the Eocene series. 



In the scale of the American series as exhibited in Alabama, 

 they would occupy a position probably near the base of the 

 " Buhrstone," or possibl}^ even lower, as the equivalents of the 

 beds exposed <m Bashia Creek, and Cave and Knight's Branches 

 (" Eo-lignitic "). 



^ The similarity existing between the Marlborough and Bognor rocks 

 has been pointed out by Conrad (Proc. National Institution, p. 172, 1841). 



3) 



