~ alent 
J. D. Dana on the Quartzite of Poughquag. 258 
posed to exist there by the Professors Rogers we found no cer- 
tain proof of, but were rather disposed to believe in a series of 
faults and monoclinal uplifts. 
The Poughquag limestone is bluish and less perfectly crystal- 
line than the Pawling; and, both the limestones ro the 
slates show a continued diminution in the degree of metamorphic 
changes as you go farther west. The Barnegat is very slightl 
crystalline, and evidently contains fossils, as has been fab i 
although none have yet been found that could be determined ; 
and the slates pass from micaceous or talcoid schists to simply 
glistening slates, and in some places to earthy slates, which are 
96). They are probably Laurentian, as state Logan and 
Hall, that is, they are equivalents of the oldest known Azo 
rocks of Cana ut as this point is not definitely settled, 
* Whatever part of the Archean beds are proved to belong to an era in which 
there was life, will be appropriately styled the Archeozoic. This term avoids the 
objection which Eozoic derives from the doubtful nature of the Eozoum. 
