LIMESTONES OF WESTERN TENNESSEE 703 



sidering the comparatively small dips characterizing the strata 

 along the Cincinnati geanticline. The absence of the entire 

 Paleodevonic suggests the existence of a long period of no 

 deposition between the Corniferous and Cayugan. During this 

 time there may have been considerable erosion. Recent observa- 

 tions in southern Ohio and northern Kentucky, east of the 

 geanticline, indicate the existence of a considerable unconformity 

 between the Cayugan and the various subdivisions of the Nia- 

 garan. This suggests the origin of the northern part of the 

 Cincinnati geanticline in times preceding the Cayugan. Obser- 

 vations are not yet sufficiently extended to lead to a definite 

 conclusion. 



There are indications of a rise of the sea bottom southward 

 in Kentucky during the latter part of the Ordovician, accom- 

 panied by a slow sinking of sea bottom northward in Ohio and 

 Indiana, but it has not yet been determined that these changes 

 produced folding parallel to the Cincinnati geanticline. The 

 absence of the entire Utica, of most of the upper Lorraine, and 

 of all except the upper part of the Richmond, in Tennessee, sug- 

 gests a relation between the facts observed in Kentucky and 

 those discovered in Tennessee. The rise of the sea bottom appears 

 to have begun much earlier in Tennessee than in central Ken- 

 tucky, and to have been more pronounced in central Kentucky 

 than in southern Ohio. It has, however, not been shown as yet 

 that this elevation was more pronounced along the crest of the 

 Cincinnati geanticline than on its flanks. The emphasis given to 

 this lack of stratigraphic evidence at present may lead to future 

 observations which may corroborate the deductions as to the 

 very early origin of the geanticline, perhaps even in Ordovician 

 times, based on paleontological data. 



LOCALITIES MENTIONED IN THIS PAPER. 

 (Consult map on p. 30 of this volume.) 



1. Paulk or Watson mill. 



la. Cave half a mile north of i. 



2. Junction of Turkey and Horse Creeks, a quarter of a mile above i. 



3. Iron bridge. 



4. Lick Ford, at mouth of Willoughby Creek. 



