252 Prof.Milne and Alex. Murray — Rocks of Newfoundland. 
\Table referred to on p. 251.] 
North America. 
Lower Laurentian 
Upper Laurentian 
Huronian 
St. John’s Group 
Paradoxides Slates 
Lower Potsdam 
Upper Potsdam 
Lower Calciferous 
Upper Calciferous 
! Levis ..... 
Quebec Group.... ■ J“— 
\ Cbazy 
Trenton and Bird’s Eye Limestones 
Utica Slate 
Hudson River Beds 
Oneida Conglomerate 
Medina Sandstone 
Clinton Group 
Niagara Group 
Onondago Group „ 
Lower Helderberg 
Oriskany Sandstone 
L. Devonian. Caudagalli Grit 
Schobarrie Grit „ 
Gaspe Sandstone 
Mid. Devonian or Upper Helderberg 
U. Devonian, Portage Group, etc 
Lower Carboniferous (Gypsiferous) ..... 
Middle Carboniferous (good coal) 
Upper Carboniferous 
Great Britain. 
Newfoundland. 
Laurentian 
Cambrian ? 
(L. Laurentian. 
(U. Laurentian. 
Huronian. 
Lingula Flags 
Primordial Silurian. 
Tremadoc Slates 
Potsdam. 
Calciferous. 
Llandeilo Beds 
B, uebec j Laüzon. 
\ Group ( Sülery _ 
Caradoc Beds 
Bird’s Eye Lime- 
[stone. 
L. Llandovery Roeks M. Silurian. 
U. Llandovery Clinton. 
Niagara P 
Wenloek. 
L. Devonian 
M. Devonian 
U. Devonian 
Carboniferous 
Devonian ? 
Gaspe Sandstones. 
L. Carboniferous. 
Millstone Grit. 
and Hearing that the newest were Lower Carboniferous. almost 
shuddered, and wondered bow it was possible to live in such a 
country . 1 
Laurentian . — Commencing witb tbe lowest member of tlie series, 
we bave a large exposure of crystalline rocfes, wbich have been 
identified as being of Laurentian age. Tbis identification is based 
on tbe relations tbey bokl to tbe Lower Silurian rocks wbicb tbey 
underlie, and on tbe litbological resemblances tbey bave to tbe 
Laurentian rocks of Labrador and Canada. Tbe limestone bands 
whicb belong to tbe Continental exposures of tbis series bave not 
yet been found ; neitber bave any traces of organic remains . 2 Botb 
1 I cannot see upon what grounds Prof. Judd founds this remark. The valley of 
tbe Great St. Lawrence, including tbe magnificent champaign regions of Western 
Canada, now called Ontario, is based upon Silurian rocks for tbe greater part, the 
highest formation being of Devonian age ; tbe beautiful valley of Stratheam, in 
Perthshire, is upon Old Red Sandstone; the valley of tbe Forth, Stirlingshire, is 
Carboniferous; and a great part of Herefordshire, Monmoutb, etc., is Lower Silurian. 
It seems to me, that the capabilities of a country, for tbe support of life, depeud, not 
upon their actual position in the geological sequence ; but upon the constituenrs 
of wbich they are composed, and the mineral character of tbe debris which is yielded 
by their ruins, and spread over tbe surface ; and also in great measure to tbe degree 
of metamorphism and disturbance by which they have been affected. — A.M. 
2 The crystalline liraestone bands of Lower Laurentian age, so well known in 
Canada, have not been seen in place, in Newfoundland; but I bave reason to tbiuk they 
