Age of the Cincinnati Anticlinal. — Foerste. 107 
phy indicates more inclined strata. The maintenance of Water- 
Lime strata in southern Hardin county in spite of the erosion 
along the headwaters of the Scioto is perhaps in correlation with 
the topographical depression of the Trenton on Prof. Orton's 
map. In a similar way, the extension of the Waterlime outcrops 
westward to the western limit of Champaign county may be con- 
nected with the depressions on the corresponding part of Prof. 
Orton's map. These later conclusions are perhaps rather forced. 
If now these investigations be extended so as to include the 
reconstructed sections of the rocks overlying the Trenton in differ- 
ent parts of western Ohio, this correlation is still further exem- 
plified. Thus it has been possible to trace out a fold whose axis 
extends through Bowling Green, North Baltimore and Findlay, 
and which involves all strata from the Trenton to the Huron shale 
But it is this Findlay fold which gives such great relief to the 
Cincinnati anticlinal in northwestern Ohio. 
Other sections between western lake Erie and the Ohio river, 
along Adams county, show another pretty strong fold, whose axis 
lies somewhat west of a line passing through Sandusky, Bucyrus 
and Delaware, and thence southward. This fold likewise involves 
all the strata from the Trenton to the Huron shale, possibly also 
the Waverly. This Bucyrus fold is in its place the chief factoi 
giving relief to the Cincinnati anticlinal, defining its eastern bound- 
ary in Ohio. Both the Findlay fold and the Bucyrus fold in- 
volve formations as high as the Huron shale. What is there to 
prove that these folds are not, therefore, of later age than at least 
the Hui'on shale ? It seems even possible that they may be latei 
than the Waverly. 
Fremont and Sandusky are 21 miles apart ; the Trenton at these 
two cities differs 927 feet in altitude. Carey and Bucyrus are 2:; 
miles apart. The Trenton here differs 722 feet in altitude. In 
both cases the difference in altitude would be magnified somew hal 
if the sections had been made directly across the strike of the 
formations involved. Now, what is the increase in the thickness 
of the sediments seaward, in this case eastward, corresponding 
with this slope of one foot descent in every 120 to 170 feet down 
the side of the anticlinal ? Practically nothing, [n other words, 
the folds which now form the chief features of the Cincinnati an 
ticlinal cannot be supposed to have existed in Trenton times 
