WAVERLY SERIES OE CENTRAL OHIO 



229 



Measures." 1 This formation is Division 3, or the Upper Waverly 

 of Professor Herrick, which he gave as 80 feet in thickness in 

 Licking county and which, from the fossils, he correlated with 

 the Burlington and Keokuk of the Mississippi valley. 2 



In 1888 Dr. Orton united the Waverly conglomerate and 

 Logan sandstone of Andrews to form the Logan group. 3 If it 



Fig. 4 — Black Hand rock in the gorge of Licking River. 



be advisable to make one formation of these two divisions, the 

 above name is inappropriate because the Logan sandstone of 

 Professor Andrews clearly referred to the upper division only, as 

 has been noted by Professor Herrick. 4 



The above ruling is believed to represent the position of the 

 United States Geological Survey, as shown by the following 

 quotation from a recent letter of Mr. Bailey Willis, assistant in 



1 Am. Jour. Sci., 3d ser., Vol. XVI, 1878, p. 216. 



2 Bull. Denison Univ., Vol. IV, 1888, pp, 99, 100. 



3 Kept. Geol. Surv., Ohio, Vol. VI, p. 39. 

 ♦Bull. Geol. Soc. Amer., Vol. II, 1891, p. 38. 



