360 



DESCRIPTION OF THE 



rock is also seen tilted at a high angle near the intersection of the trap-dikes. Be- 

 tween this place and the second fall, which is a highly inclined plane, about twenty 

 feet in height, the walls between which the river runs are composed of Nos. 288 

 and 289. At the second falls I saw no trap-dikes, the water cutting through the 

 beds of No. 289. It is very probable, however, that there is a dike at no great dis- 

 tance above, as the metamorphosed rocks dip down stream at an increased angle. 

 I did not ascend the river beyond this place. 



At the Lower Falls, the changes produced in the sedimentary beds by the intrusive 

 rocks, are remarkably interesting. No. 293 is from the north-30°-east dike, in 

 immediate contact with the bedded rock ; No. 294 is from the bedded rock in im- 

 mediate contact with the dike ; No. 295 is from the same beds, fifty yards from the 

 dike ; No. 296 is from the top of the hill east of the fall, and is the same as No. 

 291. On this hill, No. 304, which is more highly altered than some of the other 

 beds, is associated with a hornblendic rock (No. 305), but in what manner I was 

 unable to ascertain. Thin strings of greenstone (No. 297), and veins of No. 298, 

 traverse the shaly rock near its junction with the dike. No. 299 is from the shaly 

 bed above the falls, and contains organic impressions of the same kind as those 

 found on Passabika and Encampment Island Rivers. No. 302 is from shaly beds 

 on the lake-shore near the mouth of the river ; and No. 303 from the greenstone 

 dike already noticed as occurring above, just before reaching Kanokikopag Bay. 

 The red beds of this river appear to occupy the same place in the series as the 

 porphyritic beds (No. 591) seen near the Entry Point, and the Palisade Rocks, to be 

 described hereafter. 



Immediately below the mouth of this river is a north-and-south dike, which ap- 

 pears to be the same as the one at the Lower Falls. Beyond this are some expo- 

 sures of No. 620, with beds of altered shales and slates. Half a mile below the 

 mouth of the river, a bed of trap overlies a soft amygdaloidal shale, of a brick-red 

 colour, and containing many small nests of zeolites and other minerals. A quarter 

 of a mile further on is an immense exposure of basaltic rock, which protrudes 

 through beds of shale. The columns are perpendicular, and contain large angular 

 masses of a felspar rock, as exhibited below. 



MASSES OF FELSPAR INCLUDED IN BASALT. 



With the exception of the horizontal prisms seen on the west point of this bay, 

 all the columns of basaltic rock in contact with the felspar rock are perpendicular. 



