Geology and Mineralogy. 71 
tions above the Lower Silurian, including all of the Oneida, 
Medina, Clinton and Niagara formations, except a few yards of 
the latter, which all New York geological observers have described, 
is set aside by arguing the case. r. Davis’s statement with 
regard to the conformability of Lower and Upper Silurian strata 
at the eastern base of the Catskills, that gap in the series excepted, 
is cited as in opposition ; while in fact the region is outside (west) 
of the supposed area of upturning. Other arguments are based 
on facts derived from localities “far south of the Hudson River 
belts” in New Jersey and Pennsylvania, which also are outside 
of the area of Green Mountain disturbance, and affect only the 
question that future geologists will discuss with new facts—as 
to the southwestern extension or limit of the Green Mountain dis- 
i 
was left, in the writer’s hearing, by the New York geologists, at 
‘. 
cation of the limestone, the Archean rocks of South Mountain,” 
and the Ice-ace. 
noticed, the survey has recently issued the following reports. — 
No. AA, of plates, The Southern Anthracite Field, vol, IL—No. 
AC, with an atlas, On the Mining Methods and add coag poe 
; e 
489. Washington, 1883. 30 pp. 4to, with 5 plates——This paper 
-18 a full description of the bones from the Anguilla Cave—par- — 
tally described by Professor Cope in 1868. The extinct species - 
