480 J. H. GARDNER STRATIGRAPHIC DISTURBANCE TN OHIO VALLEY 



fore been assembled, though Orton, Munii, Miller, Campbell, and Glenn 

 have mapped respective portions of it. The Rough Creek uplift, mapped 

 by Orton ; the Campton anticline, mapped by Munn ; the Kentucky River 

 fault zone, mapped by Campbell, and its extension, mapped by IMiller, as 

 well as the Sebree structure of Glenn, are all but sections of it in Ken- 

 tucky. The writer's work on the Hartford Quadrangle and former studies 

 in the region of Dividing Ridge and eastward has brought to light the 

 missing links in this long chain which has been unconsciously lined up 

 by several well known geologists. From central Pennsylvania to eastern 

 Missouri is a long way for such a structure to continue and not have been 

 previously kno^\Ti in the geology of North America; but such appears to 

 be the case. At least the writer has seen no literature regarding it as a 

 unit nor has he heard it discussed. 



On the accompanying map a solid line is drawn where the structure is 

 known to be evident, and at points where it has not been mapped or is not 

 known to the writer it is sho^ra l)y broken dashes. It Mill be seen at a 

 glance that the broken line constitutes a very small percentage of the line 

 of extension. At a point northeast of Charleston, AVest Virginia; at 

 another near Paintsville, Kentucky, and a third just north of Connells- 

 ville, Pennsylvania, the folding is either obscure or has not been mapped. 

 At a point near Lebanon, Kentucky, the writer has not seen the structure 

 nor has it been mapped; but its presence here in the form of a strong 

 fault is vouched for by F. J. Fohs, formerly a member of the Kentucky 

 Geological Survey. It is at once evident that the points where its pres- 

 ence is obscure are so small as to l^e negligible. 



Intrusive Materials 



In three known localities near the line of this disturbance there are 

 intrusions of peridotite ; all three of these districts are well known : one is 

 in Fayette and Greene counties, Pennsylvania, described by R. R. Hice in 

 the biennial report, 1910-1912, of the State Geological Survey of Pennsyl- 

 \ania; one is in Elliott County, Kentucky, discovered by A. 11. Crandall 

 and described by J. S. Diller in Bulletin Number 38 of the United States 

 Geological Survey; the third is the Kentucky-Illinois fluorspar district, 

 first described by Ulrich and Smith in Professional Paper Number 36 of 

 the United States Geological Survey. 



These intrusions of periodotite are all remarkal)le in that they are in 

 isolated districts remote from all other intrusions of igneous rocks. The 

 fact that all three of these localities lie near a line of regional disturbance 

 throws a new light on their occurrence. That the pressure initiating this 



