NORTHWEST SHORE OF LAKE SUPERIOR. 



363 



to one hundred and ninety-two feet high, and from one to six feet in diameter. 

 At other points, where the underlying rock dips east-southeast 15° to 19°, the 

 columns incline toward the east at a corresponding angle. It is almost entirely 



GREAT TALIS ABES. 



detached from the mainland by a ravine, through which Palisade Creek comes from 

 the westward. On the lake side, as before stated, it rises perpendicularly to the 

 height of nearly two hundred feet in some places, and at the lowest point is not 

 less than sixty feet above the water-level. On the land side, the rocks are quite as 

 high, but may be ascended with difficulty at one or two places, by the aid of the 

 small pines and firs which have taken root in the crevices. The highest point is 

 near the west end. 



From the top of this rock a magnificent view was afforded of the Apostle Islands, 

 about thirty miles distant ; and the outline of the high ranges south of the Lake, 

 from the Porcupine Mountains to Fond du Lac, was distinctly visible. The outline 

 of the hills on the north shore, as seen from the top of the Great Palisades, is well 

 exhibited on Plate 1, N, 9. In the construction of this view, the eye of the 

 observer is supposed to be placed about three hundred feet in front of the rock, and 

 about three hundred and twelve feet above the lake-level. 



9. Palisade Creek. — This stream, which comes in behind the Great Palisades, is 

 a mere rivulet, but exhibits in the first two miles a very good section/' 1 the beds of 

 which occur in the following order : — 



1. The rock forming the Palisades (No. 251), resting on very fmely-laininated beds of the same rock 

 (No. 252). 



2. Very fine-grained basaltic trap (No. 253), which comes from under the Palisades, and crosses the 

 creek, bearing northeast. 



3. Brecciated beds (Nos. 254, 255), composed, principally, of fragments of red sandstone. 



4. Basaltic rock (No. 256), apparently intercalated with beds of highly-metamorphosed sandstone. 



5. Basaltic rock. 



Sect, 4, PL 3, N. 



