372 



DESCRIPTION OF THE 



erly course. At the next point there is thirty feet of rock, dipping southeast 19°. 

 The lower beds are like No. 189, and are overlaid by a bed of basaltic rock. The 

 fourth bay has a narrow beach, with a mural precipice back of it, from twenty-five 

 to forty feet in height. At one point it shows the following section, in ascending 

 order : — 



These rocks all dip southeast, at an angle of 19°. 



The point below is from fifteen to twenty-five feet high, and is composed of the 

 same rocks, with numerous thin veins of calcite traversing them in the line of 

 bearing. They continue up to the sixth bay, varying from, ten to thirty feet in 

 height. The point between the sixth and seventh bays is made by ten feet of No. 

 189. The seventh bay has mostly a shingle beach, but the same rock is seen in 

 low exposures up to the point between the seventh and eighth bays, where there is 

 a mural escarpment thirty feet in height. The beds are from five inches to three 

 feet in thickness, and dip east-southeast, at an angle of 19°. These beds continue 

 to the mouth of Two Island River, varying from fifteen to twenty-five feet in height. 



14. Two Island River {Nizhwahwindig Sibi). — This stream, which appears on the 

 maps to be the largest river of the north shore, between Fond du Lac Superieure 

 and Pigeon River, is, in fact, among the smallest, both in relative length and in the 

 amount of water discharged by it. It was explored to the distance of about eleven 

 miles from its mouth, following its meanders, and in a direct line from the lake- 

 shore about seven miles. In this distance the fall is six hundred and fifty-five feet, 

 and occurs, principally, in the first half of the distance named. The highest ridge 

 met with measured seven hundred and twenty-six feet above the lake-level. The 

 heights of the ridges between this one and the lake-shore, of which there are five, 

 are, 5th ridge, six hundred and twenty-four feet ; 4th ridge, four hundred and forty- 

 six feet ; 3d ridge, three hundred and seventy-nine feet ; 2d ridge, one hundred and 

 eighty-eight feet; and the 1st ridge, seventy-four feet. 



Following the river-bed, the rocks are exposed for the distance of five miles. 

 Beyond that, they are concealed by a few feet of drift, but are to be seen on the 

 tops of the high ridges, and in the ravines cut down their slopes by occasional 



For the first four miles, the rock is a dark-red, coarse-grained amygdaloid, shaly 

 and decomposing at some points, and alternating with beds of a firmer and more 

 compact texture at others (Nos. 188, 189, 190). At several points greenstone was 

 seen in the bed of the stream, and at the distance of four miles from the mouth is 

 a large uplift, overlaid by No. 188. At the junction of the greenstone and amyg- 

 daloid, the overlying rock assumes a more trappous appearance, becoming harder, 



1. Shaly amygdaloid, 



2. Metamorphosed sandstone, 



3. Shaly amygdaloid, 



4. Metamorphosed sandstone, 



4 

 16 

 7 



rivulets. 



