1887.] ^^ [Stevenson. 



was not examined and the thickness of the bed, wliich is said to be 

 between three and four feet, was not ascertained. 



The road descends rapidly on the northern side to a large branch of 

 Hunting Camp creelv, wliich follows a long gorge through Brushy 

 mountain. The upper conglomerate of the Chemung is shown soon after 

 the stream has been reached and forms a ridge on each side of the road ; 

 the exposed thickness is not far from forty feet. The layers of conglom- 

 erate are distinct and one of them is ferruginous, with pebbles as large as 

 a walnut. The gorge below this is exceedingly rugged, the shaly beds of 

 the Chemung being held in cliffs by thick flags which are shown nicely 

 in the stream so often crossed by the road. A second gray sandstone, 

 with layers of conglomerate and closely resembling the former, is shown 

 just above the mouth of the gorge. The more shaly beds at the base of 

 the Chemung are shown as one approaches Hunting Camp creek, at Mr. 

 Soutter's. There one sees, in looking back, that the tributary streams 

 have cut Brushy mountain into parallel ridges, each with one of the 

 harder Chemung sandstones for its crest. 



The lower shales of the Chemung with their hard flags form a low but 

 very distinct ridge, which follows the foot of Brushy mountain and curves 

 round the easterly end of the Garden anticlinal to form a similar ridge for 

 a little distance between Round and Rich or Wolf Creek mountains. The 

 Hamilton shales, which can be hardly separated from the Chemung dur- 

 ing a hasty examination, continue to the northerly side of Hunting Camp, 

 where the road first reaches it, though at a little way further down the 

 stream cuts almost to their base. The Oriskany sandstone is exposed just 

 north from the creek at barely a mile below Mr. Soutter's and thence its 

 fragments are very numerous. The rock crosses the end of Round moun- 

 tain as the Burk's Garden anticlinal dies away, and it is shown in the 

 road at a short distance above the mouth of Hunting Camp creek. The 

 most notable fossil is the stem of a criaoid of which individual joints are 

 extremely common. Spirifera arrecta appears to be more abundant than 

 any other of the ordinary forms. Evidently associated with the sandstone, 

 but not seen in place, is a white chert, which contains a delicate Stroma- 

 topora. Whether this represents the Lower Helderberg or not could not 

 be determined. 



The road to Seddon leaves Hunting Camp creek at about two miles 

 from its mouth and crosses Brushy mountain to Rich valley, at Seddon. 

 The shales northward from the creek on this road are without doubt 

 largely Hamilton, but beyond the creek southward the road quickly 

 enters the low ridge of olive shales and flags, which has been referred to 

 already as persistent along the foot of Brushy mountain for fully twelve 

 miles. As the road ascends the mountain, it passes over olive flags with 

 olive, gray, ash'en, blue and yellow shales, continuing to the summit of 

 the road ; the southward dip being somewhat irregular, but rarely falling 

 below twenty, or rising above forty degrees. These shales show no 

 fossils aside from occasional impressions of cricoid joints and rude traces 



PROC. AMER. PHILOS. SOC. XXIV. 125. L. PRINTED APRIL 30, 1887. 



