1S84.] 141 [Stevenson. 



Medina, lower. 

 5. Red shales and sandstones, dip 20° to 15° , 400' 



Bits of fossil ore occur along the exposure of No. 1, but the ore was not 

 seen in place. The white Medina, with a total thiclcness here of about 

 215 feet, forms a handsome cliff on both sides of Little Moccasin gap, the 

 dip at the northerly crest of Clinch mountain being not far from 20 de- 

 grees ; thence the outcrop extends northwardly to form Brumley moun- 

 tain east from the gap. The red beds of the lower Medina are moderately 

 well exposed ; the higher beds are sandy and tend to be hard. The ex- 

 posures of red and yellow shales belonging to the Hudson continue until 

 Lilly's house is reached, at nearly three miles from the river, where the 

 Trenton limestone is shown. The exposures between the house and the 

 summit of the gap, somewhat more than half a mile, show little aside from 

 reddish, impure, very argillaceous limestones, in which the dip gradually 

 diminishes until, at the summit, it becomes barely 10 degrees toward south 

 of south-east. Compact limestone begins just beyond the summit and con- 

 tinues until the "bottom" of Big Moccasin creek. It is dark blue, 

 weathers grayish, is in thick layers' separated by thin beds of shale, and 

 contains few fossils, only some bryozoans having been seen. Shaly lime- 

 stones appear in the "bottom," but the massive beds at the base of the 

 Trenton are soon reached and they remain in sight to Hansonville. Very 

 little chert was seen thus far. 



Moccasin ridge is beyond Hansonville. White chert is abundant from 

 the first summit of the ridge to Tarr's fork of Moccasin and the massive 

 limestones seen along that stream contain great balls and lenticular masses 

 of black chert. These beds are exposed on the north branch of that fork, 

 where they dip south of south-east at from 15 to 22 degrees. The lower 

 beds shown at the summit between Tarr's fork and a' branch of Copper 

 creek have cherty reticulations on the layers so that the vertical surfaces 

 of the beds acquires a fretted appearance. Here one comes to the shales 

 of the Knox group and the road passes into the area drained by the Clinch 

 river. 



Returning to Clinch mountain. Medinaformsthecrestof Brumley moun- 

 tain, whicli attains its most northerly extension almost due south from Leba- 

 non and thence has an almost eastward trend into the "loop " of Cedar 

 creek. There at Hayter's gap, the mountain is crossed by the road lead- 

 ing from Lebanon to Saltville, along which the white Medina is seen at 

 the summit and the Clinton shales are reached at, say, half a mile from 

 the Poor Valley road. These shales form the mountain bench which fades 

 into Poor valley and they are shown occasionally along the road until it 

 leaves the valley to pass through Brushy mountain at nearly six miles 

 from Saltville. The axis of the Burlc's Garden anticlinal is not shown 

 here, nor is it exposed on Tumbling creek, three or four miles further east, 

 though there both slopes can be recognized. 



Tumbling creek is formed by the union of several streams in the north- 



