304 The American Geologist. December, 1902. 
A short distance northward, just above the home of Taylor 
Brock, the Devonian is 12 feet thick; at the top the rock is 
cherty ; just beneath it contains Cyathophylloid corals; near the 
base 5^ feet of the rock is massive and finegrained. A short 
distance northward, just below the mouth of Coldwater branch, 
the Devonian is 17 feet thick, consisting- in descending order 
of brecciated brownish rock, 9 inches ; white limestone, i foot ; 
thin limestone layers, 2>4 feet; massive limestone, 7-/3 feet; 
cherty limestone, 2^^ feet ; and finegrained limestone, 3 feet. 
The Devonian was traced 3 miles above the mouth of Cold- 
water branch, and is said by the natives to occur 2 miles farther 
northward, in the vicinity of Adams mill. 
At a number of localities fossils are not uncommon. 
Among these a specimen of Amphigenia suggests the Cornif- 
erous age of the rock. It is a pedicle valve, 8.4 cm. long, 4.3 
cm. wide at a point about ^/g of the length of the shell from 
the beak, and 2.6 cm. deep; the sides are strongly compressed 
so that the shell appears more elongate than most of the spec- 
imens referred to Amphigenia clongata. The cast of the spon- 
dylium is distinctly shown. The specimen was found at the 
Sulphur Spring locality. 
It is possible that the sandy layer, 3 inches thick, at the 
base of the black shale on Forbush creek corresponds to the 
sandstone at the top of the Devonian at its most southern ex- 
posures on Fishing creek. 
Neiv Albany or Chattanooga Black Shale. — East of Fish- 
ing creek, along the road leading from Somerset west across 
the iron bridge and passing the house of V. L. Gossett, the 
Xew Albany or Chattanooga Black shale is 46 feet thick. It 
decreases gradually in thickness westward. At Burksville it 
is 30 feet thick ; at Martinsburg, 22 feet ; west of the crest of 
the anticline it varies considerably and irregularly in thick- 
ness, from 28 feet as a maximum to 4 or 5 feet, and occasion- 
ally is absent altogether. 
The Devonian along Fishing creek probably rests upon 
Osgood strata. 
D. The Ordovician east of the anticline in southern 
Kentl'cky. 
The Richmond formation. — Along the branch north of the 
home of V. L. Gossett,' 27 feet of Ordovician rock are exposed 
