1892. ] NEW YORK ACADEMY OF SCIENCES. 137 
Professor Merrill proposed the following classification for this 
series of rocks :— 
a Bearfort and Schunemunk 7 
ane? ies { mountains, 700 ft. t Hamilt 
Blue Argillite and Longwood and West Milford raete. 
Gray wacke. valleys. 1000 ** J 
eae iS i Newfoundland, Upper Long- Corniferous. 
Heo Grit. ie wood, and Pickatinny. 50 ‘* { Oriskany. 
Blue Limestone with / Upper Longwood, Milton, New- Lower Helde- 
Fossils. foundland, ete. 200 «¢ berg. 
Red Shale. Newfoundland, etc. 200 ‘< Medina. 
Red Conglomerate Green Pond mountain, ete. 600 ** Oneida. 
2190 ft.772 
In the graywacke slates at Clinton Falls, about one and one-half 
miles N.N.W. of Newfoundland, N. J., Professor Merrill states 
that “there seem to be traces of plant ‘impressions in them, and 
they may correspond to the beds in Orange county, New York, 
which have yielded Psilophyton princeps, aud other Devonian 
plants; that they are of Devonian age is beyond question.’” 
The “Geological Map of New York City and Vicinity, by D. 
S. Martin, 1888,” gives the region of Green Pond and Bearfort 
mountains, New Jersey, as belonging to the Upper Silurian and 
Devonian periods. In the ‘‘ Legend’ the green color is stated to 
represent the Upper Silurian, the ‘‘Green Pond Mountain forma- 
tion,’’ which is given in parentheses as of Oneida and Medina age. 
The green color is spread over the Green Pond, Copperas, Kanouse, 
and Bearfort mountains; while in the valleys partly between these 
mountains is the brown color which represents the Devonian and is 
explained as ‘‘ Slates, Hamilton in part (mingled with Ordovician 
B.).”’ The division B. of the Ordovician is given in the legend as 
‘Slates and shales (Hudson River).’”’ In the explanation of this 
map Professor Martin states, ‘It is now known that the ‘Green 
Pond Mountain’ series, long supposed to be of Potsdam age, is 
really at the base of the (upper) Silurian, and represents the Oneida 
and Medina rocks of New York State, or the Levant (No. 4) of 
the First Pennsylvania Survey. The heights here are, therefore, 
‘Mountains of Four,’ and are colored accordingly. They doubtless 
rest upon Ordovician beds, which are seen outcropping at a few 
points on the eastern edge, and forming an island in Greenwood 
Lake, close to the State line. But the slates and shales of the ad- 
jacent valleys are the most uncertain ground in the map. They 
were long called Hudson River, but now are proven to be, at least 
in part, of Hamilton age. W hat portions, however, are e such, and 
what may be still regarded as Ordovician, are points that are as 
yet unknown, and will require careful field-work to determine.’”* 
1 Op. cit., p. 114. Op: cits, palo. 
3 Geological Map of New York City and Vicinity, by Daniel S. Martin, Notes 
and Explanations, p. 4, 
Vou. XI.—10. 
