GIBB — ON CANADIAN CAVERNS. 



341 



01^ CANADIAN CAVERNS. 



By Geoege D. G-ibb, M.D., M.A., F.Gr.S., Member of the Canadian 



Institute. 



(Gontiniied from ijcicje 219). 



In the foregoing account it has 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 arclied rocks at Perce, Gaspe... 



Lower Carboniferous 



3 

 27 



Gothic arched recesses, Gaspe Bay. 



Portage and Che- 

 mung groups 

 Helderberg series 



Old Red or 

 Devonian 



4 

 S 

 9 

 25 

 26 

 28 



Perforations and Caverns of Michihniacinac 

 The Old Woman, Cape Gaspe 



Onondaga Salt gTOup 

 Gaspe limestones 

 Niagara „ 



5) 55 

 55 55 

 5) 55 

 55 55 



Upper 

 Silurian 



Eramosa Cavern 



Subterranean Passages, Manitonlin Island... 



7 



18 



Pillar Sandstones, north coast of Gaspe 



SiUery group 



53 55 



Middle 

 SUm'ian 



20 

 24 

 29 

 6 



21 

 11 



Gibb's Cavern, Montreal 



Probable Caverns at "Kingston 



Murray's Cavern and Subterranean River ... 

 Arched and Flower Pot Rocks, Miugan 



Probable Caverns at Chatham 



The Pictured Rocks, Lake Superior 



Trenton limestone 



55 55 



55 55 



Chazy, Bu-dseye, 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 Mountaia and Pie Island Pilasters, 

 Lake Superior 



Sandstone 

 Greenstone 

 Greenstone trap 



Huronian 

 Rocks 



15 

 16 

 17 

 19 

 22 

 23 

 30 



The Steinhauer Cavern, Labrador 



Basaltic Caverns cf Henley Island 



Empty Basaltic Dykes of Mecattiua 



Colquhoun's Cavern, Lanark 



Quartz Cavern, Leeds 



Probable Caverns Iron Island, Lake Nipissing 



Crystalline Umestone 

 Basalt 



Crystalline Limestone 



55 ^ 55 



Quartzite 



Crystalline limestone 



Laurentian 

 Rocks 



