34 Cincinnati Society of Natural History. 



is divisible into two domes — the Nashville dome of Tennessee 

 and the Jessamine dome, culminating in Jessamine Co., Ky. 

 The whole uplift is known as the Cincinnati anticline. 



Local folds and faults. — The rocks of the Eden and 

 probably of the Maysville are locally distorted by low 

 anticlines, which are only a few feet across. Thrust faults 

 are in many cases associated with these folds, the fault 

 plane running in the direction of the axis of the anticline. 

 No faults are known to exist in this region except in connec- 

 tion with anticlines. These faults have a throw of several 

 inches and a hade of 25° to 35°. There appears to be no 

 accordance of direction of the axes of these folds and faults. 



Thirteen small folds and faults have been noted by the 

 writer within the area of the Cincinnati quadrangle. Of 

 these eight are at an altitude of from 620 to 640 feet A. T. 

 or from 30 to 50 feet below the Eden-Fairview contact, 

 that is, are found in the McMicken member of the Eden. 

 Five of the observed folds affect the shale bed and limestone 

 strata just beneath the Eden-Fairview contact. 



In all the folds and faults of the lower series (those of the 

 McMicken), but a small section is exposed, so that it is^not 

 known to what extent the distortion affects the strata 

 vertically. All are in stream beds, and while cross sections 

 of the folds or combined folds and faults are usually exposed 

 in stream banks, it appears that the axes trend in the same 

 general direction as the stream valleys in which the folds 

 are found. One faulted anticline which was observed^ is 

 exposed in the undercut bank of a meander curve. The fault 

 where exposed in the stream bank has a hade of 30° and 

 throw of six inches. Upstream, the fault dies out in a low 

 almost symmetrical anticline, whose sides have a dip of 

 almost 10°. The fold extends only about 25 feet in the 

 same direction before disappearing entirely. Its extent in 

 the other direction is not shown. 



*Matson: U. S. Geol. Surv. Water Supply Paper 233, 1909, p. 26. 



tThese altitudes are judged from the topographic map of the Cincinnati quadrangle. 



JOn the west branch of Sycamore creek, north central part of section 22, Symmes township. 



