Notice of the Ancram Lead Mine. 247 
the tuff, the imbedded sandstone masses in that rock must 
have proceeded. And this is one of those cases in geology, 
_ in which it is demonstrable, that a long interval must have 
elapsed between the formation of differeut beds of the same 
rock. In this instance, it is certain, that the lower beds of 
-the slate and greenstone must have been first arranged and 
consolidated ; and then, some violent convulsion must have 
must have been reversed, and the tuff cemented and con- 
solidated ; and finally, the agents employed must have been 
brought to the same state as when the lower beds of slate 
were sited, in order to the production of the same 
slate above the tuff. Such a remarkable series of revolu- 
tions must have demanded a considerable length of time. 
Ihave no leisure, nor disposition, to discuss the bearing of 
these facts upon existing geological systems ; nor to point 
out their important relation to the first chapter of Genesis. 
I know of no facts in the geology of our country, that show 
80 irrefragably, that long periods of time must have been 
®ccupied in the formation of the secondary rocks, 
2. 
oe o 
P. S. Upon further examination, | am inclined to refer 
the comglomerate rock described above, to the Conglom- 
erate Quartz Rock of MacCulloch, as described in his geology 
of the Western Isles, and in the London Geological Trans- 
&€tions, Vol. 1. p. 60. Second Series. f 
“a gi eos, 
Art, VILI.—WNotice of the Ancram Lead Mine, by Cuares 
A. Ler. 
To rHE Epiror. 
I uarexy visited the lead mine at Ancram, Columbia 
County, N. Y. and as | have seen no notice of this locality 
' the Journal of Science and Arts, the following particulars 
May not perhaps be wholly uninteresting. : 
In passing from Salisbury to Ancram, we first meet will: 
ia 
alternations of Gran. T.imestone and Mica Slate and the 
