ClIBB — ON CANADIAN CAvEKNsi. 
341 
ON CANADIAN CAVERNS. 
By George D. Gibb, M.D., M.A., F.G.S., Member of the Canadiuii 
Institute. 
(Continued from imcje 219). 
In the foregoing account it lias been my aim and endeavour to 
describe the geological formations in which the caverns existed ; this 
will be seen at a glance in the following table : — 
1 
Caverns on shores of Magdalen Islands 
New Red Sandstone 
2 
5 
Caverns and aixhed rocka at Perce, Gaspe... 
Little River Caverns, Bay of Chalenr 
Lower Carboniferous 
3 
27 
Gothic arched recesses, Gaspe Bay 
Cavern in Bass Island, Lake Erie 
Portage and Che- 
mung groups 
Helderberg series 
Old Red or 
Devonian 
10 
B 
9 
25 
26 
28 
7 
18 
Perforations and Cavei'ns of Michilimacinac 
The Old Woman, Cape Gaspe 
Flower Pot Island, Lake Hui-on 
Onondaga Salt group 
Gaspe Hmestones 
Niagara 
)) )) 
)) )5 
5) )) 
n J) 
Upper 
Silm-ian 
Subterranean Passages, Manitonlin Island... 
Pillar Sandstones, north coast oi Gaspe 
SUlery group 
)) }) 
Middle 
Silm-ian 
20 
21 
29 
6 
21 
11 
Probable Caverns at Kingston 
Mmray's Cavern and SubteiTanean River ... 
Arched and Flower Pot Rocks, Mingan , . 
Probable Caverns at Chatham 
The Pictured Rocks, Lake Superior 
Trenton limestone 
Chazy, Birdseye, and 
Black River lime- 
stones 
Calciferous sandstone 
Potsdam sandstone 
Lower 
Silurian 
12 
13 
14 
St. Ignatius' Caverns, Lake Superior 
Pilasters of MammeUes, Lake Superior 
Thunder Mountain and Pie Island Pilasters, 
Lake Superior 
Sandstone 
Greenstone 
Greenstone trap 
Huronian 
Rocks 
15 
16 
17 
19 
22 
23 
30 
The Steinhauer Cavern, Labrador 
Empty Basaltic Dykes of Mecattina 
Quartz Cavern, Leeds 
Probable Caverns Iron Island, Lake Nipissing 
Crystalline limestone 
Basalt 
CrystaUine Umestonc 
Quartzite 
Crystalline limestone 
Lam'entiau 
Rocks 
