GEOLOGICAL MAP OF THE PENINSULA OF PERCE, 

 P. Q., AND ITS ISLANDS 



BY JOHN M. CLARKE 



So much has been published in these reports regarding the geology 

 of Perce and other parts of the Gaspe peninsula, that it seems proper 

 to insert here a completed and detailed map of the highly disturbed 

 but exceedingly instructive Paleozoic geology of the Perce penin- 

 sula. The accompanying map is based upon a corrected plane 

 survey of the geographic outlines of the region made preparatory 

 to the meeting of the International Congress of Geologists in 19 13. 

 No more exact plane map exists nor has any topographic map of 

 Perce been made. It is not designed here to indicate the sectional 

 structure of the region; for these details other publications may be 

 consulted, as they are all a matter of record. The map explains 

 itself but the following brief annotations may be added : 



The rock sections are essentially sea-cliff sections. The exposures 

 are otherwise shown only around and beneath the cliffs of the Table- 

 a-Rolante and in streams cutting down to the sea. The interior of 

 the country back of the mountain referred to is a rolling, heavy 

 timbered wilderness entered only by trails, with few streams and 

 very rare rock exposures. The rocks of the Bona venture con- 

 glomerate, which is believed to represent in a broad way the forma- 

 tions of the later Devonian and earlier Carboniferous, are approxi- 

 mately horizontal and when not so have been apparently subjected 

 to comparatively recent dislodgment. These beds are thought to 

 be of continental or delta origin, and while they cover the greater 

 area of the peninsula and its islands, they are the latest rock deposits, 

 resting upon a pavement of Paleozoic strata upturned at a very 

 high angle. About the front of Mount St Anne the soil consists 

 of a sheet, largely of residual material, lying in depressions which 

 are more or less swampy because of obstructed drainage. That 

 this area has been invaded by the sea in comparatively recent times 

 is quite certain, as corroborative evidence of negative and positive 

 movements of the coast is very clear, and the level submarine rock 

 floor intimates the seaward extension of the present rock cliffs. 



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