382 The American Geologist. December, 1903. 
shales and Niagara ("Coralline") limestone.* Mr. Schuchert 
has now shown that the Cobleskill (Coralline) limestone is of 
later age than the Niagara, forming the lower member of the 
Manlins formation f and this change should" be made in my sec- 
tions cited above. It is to be noted in this connection, however, 
that Dr. Clarke regards the Cobleskill dolomite as a unit forma- 
tion succeeding which are the Rondout waterlime and Manlius 
limestone at the top of the Upper Silurian system. Mr. Schu- 
chert also states that the subjacent green shale of Schoharie 
county cannot be the Clinton "but probably is the thinned east- 
ern edge of the lower part of the Cobleskill of the Litchfield 
section [Herkimer Co., N. Y.$]/' "although in a paper of the 
previous year Messrs. Ulrich and Schuchert stated that they 
considered "the so-called 'Clinton' of the Schoharie section... 
the overlapping eastern edge of the Salina deposits." $ Mr. 
Schuchert has written me as follows regarding this change : "It 
seems more natural to refer the hiatus to beneath these shales 
and above the upturned Hudson rather than between the 'Clin- 
ton shales' and the Manlius. If they are Salina in age there 
must be a short hiatus between them and the Manlius. How- 
ever, I think it more natural to regard these shales as the in- 
vading base of the Manlius. They appear deeper and deeper 
(i. e. older) in the sections from Albany county into New 
Jersey. The invasion is from the south." || 
In my section one-half mile south of New Salem and west 
of the Markel house, ten inches of greenish sandstone to coarse, 
arenaceous shale, directly beneath the Waterlime (Rondout) 
was stated to represent, possibly, "the attenuated Clinton forma- 
tion. "If Mr. Schuchert concludes that this layer is not to be cor- 
related with the Clinton but may be "regarded as the invading 
basal deposits of the Rondout." 
Since the publication of my work in the Helderberg region 
1 )r. Clarke and Mr. Schuchert have used the name Lorraine 
beds for the upper part of the Hudson River beds in the Mo- 
• Eighteenth An. Rep. State Geologist, 1899 [1901], pp. 66-68. 
t Am. Geol., vol. xxxi, pp. 175-177. 
t Ibid. p. 3 76 and on p. 173 under description of Schoharie section is 
the statement that "the age of these olive green shales seems to be Lower 
Cobleskill." 
§ JT. T. State Museum, Bull. 52, 1902, p. 650, f. n. 
|| Letter of May 10, 1903 . 
t nth An. Rep. State Geol., 1899 [1900], pp. 338. 
° Am. Geol , vol. xxxi, p. 178. 
