396 Scientific Intelligence. 
Along the eastern border of the State of New York, through the- 
towns of Amenia, Northeast, Ancram, Copake and Hillsdale, occur 
in the valley region west of the Taconic Range, in a limestone 
they are situated mostly near the junction of the limestone and 
the overlying slates; and the limestone in the part of the sam 
elt between Pe age and Poughkeepsie contains fossils of Calcif- 
erous and Trenton 
The evidence of tthe oie cee and for the Lower Silurian 
age of the beds is as good for ew York region as for the 
Pennsylvanian ; and yet the eae is more or less crystalline, 
and the slates are oo mica schists. 
In conclusion I observe that the aay of the stratigraphical 
relations of so-called metamorphic rocks is not solely a study of the 
beds . " rigs or of _& gneiss, or of a mica schist or other bags 
gneiss reichaut Waite aad evidence that it was part of a strat- 
tions of granite, Ssyenyte, dioryte, granites which rocks are 
known e sometimes of igneous origin. 
Pda ehmann’s deductions as to the conversion of dikes and 
s by pressure into ambiguous strata, and as to the production 
of dahistose bedding in gr anulyte and like rocks by plasticity In 4. 
confined area, have a very limited application ; and n Sere 
te ed ber to be deceived by such an occurrence 
3. Geology of Centre County, Pa.; by E. V. pheviintad: A 
endix x Extracts from Report to Lyon, Shorb & Co. 
>». LESLEY ; Appendix Bb, i goal on oe Geological ‘forma- 
ots from 2 Cras ae a ey F. Platt, A. 8S. McCreath, 
7" in 
i the tc 3 
Nittany, Penn’s and Brush cies Mr. d’Invilliers describes: 
the iron ore as chiefly derived from the oxidation of iron in sand- 
