members of the New York series, we reach the limestones of 
tween the Calciferous and Chazy formations. Next in ascend- 
_ ‘ig sequence, occurs a mass of limestones not less than 2,000 
feet in thickness, and probably representing both the Chazy and 
_ the Trenton. From it the following Trenton species were ob- 
tained by Mr. Billings in Sudbury: Stenopora fibrosa, Petraia 
corniculum, Glyptocrinus ramulosus, Ptilodictya acuta, Lep- 
tion, Which brings up the Levis formation, with its characteris- 
tic fossils against the Trenton. A ravine marks the line of 
venty miles from the southern line of Sudbury northward to 
dge, where it joins the great western fault. To the 
West of this line, fossils of the various divisions of the Trenton 
yOUp are found in numerous localities, and to the east, the 
haracteristic forms of the Levis formation, among which Mr. 
illings has detected Plewrotomaria Quebecensis, P. Missis- 
> Murchisonia Vesta, Ophileta bella, Maclurea matutina, 
‘ pondersa, and Bathyurus Saffordi, besides which many 
“tge Orthoceratites are seen in section. These fossils are found 
> “any localities in Sudbury, Cornwall, Middlebury, and 
ve we. The limestones are for the most part bluish, but 
Ne closely associated with the white marbles quarried in these 
A oe bee eeg ote  t| NE Pa aN Te PP 
a ee el eT a ee ee et 
