TOPOGRAPHY 



379 



sealevel. The slope to the north is quite rug-ged, and many small preci- 

 pices from 15 to 40 feet high have been developed, due to the ease with 

 which the rock joints. The particular interest attached to this slope, 

 however, is due to the occurrence of two large boulder deposits. One 

 of these fills a depression just east of the peak, and tinged b}^ local tradi- 

 tion is popularly known as the Devils garden. It is an irregular oval 

 in form, with the longer axis running southwest, and occupies an area 

 of about 50 acres. Higher parts of the mountain inclose it on all sides 



Syenite LLU PoRfn4YR-r ^^ GNeis* UUilil Upter Cambrkvn I I Drift 



Figure 1. — Map of Rigaud Mountain, Canada. 



except the northern, which is lower, especially in tlie northeast, where 

 the deposit terminates in a rather abrupt fall of about 20 feet. The 

 boulders are subangular or well rounded, from 5 to 20 inches in diameter, 

 and are arranged in a series of parallel ridges which run in a direction at 

 right angles to the longer axis. These ridges when well marked have 

 convex crests, thus giving to the garden an undulating appearance when 

 viewed broadly ; they are from 4 to 6 feet high and from 20 to 30 yards 

 apart. In some parts of the area the ridges are very indistinct, and 



