74 



GEOLOGICAL REPORT. 



[1114 



feet above low water. About 3 miles W. of Aberdeen, there is a change from 

 the level prairie country further "W., to sandy hills, with some pine. 



Ill On the road, from Aberdeen to Columbus on the W. side of the 

 Tombigbee, there is a change from the sands to the Eotten Limestone and back 

 again, as indicated on the map ; the aspect of the country varying accordingly. 

 The section at Barton has been given above (l[107, Sec. 5) ; a section similar to 

 it in most respects, is mentioned by E. Q. Thornton, Esq., of the Alabama 

 Survey, as occurring near Colbert's Ferry, below Barton. At Plymouth Bluff, 

 we find one of the best and most characteristic exposures of the Tombigbee Sand 

 Group, of which a detailed section is given below. It was early visited and its 

 fossils collected and studied, by Dr. William Spillman, of Columbus, who 

 possesses a fine collection of its fossils ; a number of these have been studied 

 and named by Tuomey, and are mentioned in the catalogue appended to the 

 second Report on the Geology of Alabama (^258 ff.) ; most of the fossils 

 marked "Columbus," "Lowndes county" and "Miss." are found at Plymouth 

 Bluff. 



A catalogue of the fossils from this interesting locality, kindly furnished me 

 by Dr. Spillman, is given in another place. 



(No. 10.) 



SECTloX ON THE TOMBIGBEE, AT PLYMOUTH BLUFF, 



LOWNDES COUNTY. 



