5 

 EXCURSION A 2. 



THE HALIBURTON-BANCROFT AREA OF 

 CENTRAL ONTARIO. 



BY 



Frank D. Adams 



and 



Alfred E. Barlow. 



CONTENTS. 



PAGE. 



Introduction 6 



History of geological exploration in the Laurentian 



of Eastern Canada 7 



Physical features 10 



Geology of the area 13 



I. The invading batholiths 14 



II. Rocks of sedimentary origin 20 



(a) Limestones 20 



(b) Quartzites 20 



(c) Gneisses of sedimentary origin (para- 



gneisses) 23 



III. Amphibolites 23 



IV. Gabbros and diorites 27 



V. Nepheline and alkali syenites 28 



VI. Contact phenomena of the granite batho- 

 liths 29 



VII. Distribution and thickness of the Grenville 



series 31 



VIII. Relation of the Grenville series to other 



Pre-Cambrian series 33 



IX. Summary of conclusions 35 



Itinerary of the Excursion — 



Annotated guide, Montreal to Ormsby Junction 37 



Geology in the vicinity of Ormsby Junction. . 44 



