BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 4, pp. 313-332 August 4, 1893 



RELATIONS OF THE LAURENTIAN AND HURONIAN ROCKS 



NORTH OF LAKE HURON* 



BY ALFRED E. BARLOW 



{Read before the Society December 30, 1892) 



( '< INTENTS 



Page 



Introduction 314 



The Huronian Rocks 314 



The Laurentian Rocks 315 



l leneral Course of the Contact on Lake Huron 315 



The Lake Huron Localities in Detail 316 



Killarney Village :;ii; 



Huronian and Laurentian Rocks found there described 310 



Extent of the Huronian 317 



Beaver, Fox and Balsam Lakes — The Rocks and their Contacts :!17 



Character, Contact and Relation of the Rocks of Three-mile Lake Ml 7 



, Transitional Rock-masses between Three-mile and Brush Camp Lakes. . . 318 



The Contact on Brush ( 'amp Lake 318 



The Quartzite and Gneiss of Crooked and Johnny Lakes 318 



< roschen Township and Lake Panache 31S 



Direction and Extent of the Contact 318 



Quartzite and its microscopic Examination Mis 



Disturbance causes Change of Strike 319 



Alteration in Character of Rocks accompanies Change of Strike 31!) 



Microscopic Examination of altered Quartzite 311) 



Bedding Planes of and intrusive Masses in the Huronian mica Schists. 320 



Microscopic Examination of Quartzite with granitoid < ineiss 320 



Other Localities 321 



Wavy Lake 321 



Direction of the Contact 321 



( 'haracter and Relation of the Gneiss and Quartzite 321 



Microscopic Examination of the (ineiss 321 



* 'leavage Planes and embedded Quartzite 322 



Chiefs Lake 322 



The Contact 322 



The Rocks 322 



* Published by permission of the Director of the Geological Survey of ('ana da. 

 XLVTI— Bur.L. Geol. Soc. Am., Yor. 1, ls:i_>. l ; 'l^>) 



