398 S. W. Ford—Age of Slaty and Arenaceous Rocks. 
York, vol. i, 
1846). Later, Mr. R. P. Whitfield, in a letter addressed to Dr. 
C. A. White, and published in Part I, vol. iv, of Lieut. 
W heeler’s Reports on Geographical and Geological Surveys west 
of the 100th meridian, considers the Schenectady rocks to be of 
Lorraine age, but does not support his position by the evidence of 
fossils obtained at that locality. He also refers to the Lorraine 
certain “disturbed and nearly vertical layers’’ occurring in the 
valley of the Norman’s Kill, near Albany, which, he says, are 
lithologieally undistinguishable from the rocks at Schenectady 
and places the Norman’s Kill Graptolitic beds, which are met 
with only a few hundred yards distant, in the Utica formation. 
Mr. Whitfield is quite possibly correct in considering the nearly 
vertical layers above spoken of identical with the Schenectady 
eds; but it by no means follows from this that the layers are 
Lorraine, or that the Norman’s Kill Graptolitic beds are Utica. 
he rocks at Schenectady are nearly horizontal, or with only 
a slight inclination to the southward, and continue in that 
position for three or four miles to the east. Not far trom 
traceable in its effects as far south as Kingston. It appears to 
hold the same relation to the Great Appalachian fault that the 
mens of Graptolithus pristis, G. mucronatus and Triarthrus Beek i 
and from another quarry, a little to the west of Rexford flats, © 
of the Lorraine that I have examined, and more nearly rese™” 
ble those of the Utica formation of Northern New York. The 
Schodack Landing, N. ¥., March 5th, 1885, 
