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A. WINCHELL — A LAST WORD WITH THE HURONIAN, 



one mile north of which it becomes the site of a marble quarry, yielding a 

 delicate and beautiful product. Toward the southeast it has been traced for 

 nearly six miles; but its continuity with limestones seen in the valley of the 

 Thessalon is a question which will be taken up after completing a descrip- 

 tion of the section exposed along Echo lake and northward. 



The breadth of the limestone outcrop is about 400 feet, if we take the 

 mean of the points on opposite sides of the lake. Immediately north a hill 



FiGUKE 3. — View of rough Surface of Echo Lake Limestone. 



(number 5) rises on the western shore about 100 feet, and the rock exposures 

 present every appearance of a quartzose character; but the hill was not 

 ascended. In close contiguity is another (number 6), which examination 

 showed to be essentially quartzitic and finely granular, with minute dissemi- 

 nated individuals appearing like reddish orthoclase, but which in thin sec- 

 tion prove under the microscope to be, in part, specks of iron peroxide. This 

 f )rmation is very thick-bedded, and dips about 20° toward south 40° west. 

 Thus it appears that though the limestone is between two slate conglomerates 

 it is separated from the upper by 2,700 feet, and from the lower by 900 feet. 

 In other words, the slate conglomerates are here at least 3,700 feet apart. 



Beyond this for the space of one-third to one-half a mile the high hills 

 (number 7) were not examined, but still north for the distance of one and a 



