16 Captain Bayfield on the 
it to Thunder Cape. Itis also met with on the opposite 
side of Thunder Bay, and in small quantities to the Grand 
Portage, and even tothe St. Louis. 
On the south-west side of Ile Royale it is found plentifully, 
being there frequently a conglomerate precisely similar to 
that of the opposite point of Keewawonan, on the south 
coast. 
It forms cliffs alternately with sandy beaches on the south 
coast from Point Iroquois to the St. Louis. The magnifi- 
cent cliffs of Les Portailles and of Grand Island, are of this 
rock, where it attains an elevation equal to that in Neepigon 
Bay on the north coast. At Les Portailles and Grand Island 
there are perpendicular cliffs, from 300 to 400 feet above 
the lake, broken into the most beautiful and picturesque 
arches,* (some of which a boat can pass under,) porticos, co- 
jumns, and caverns of immense dimensions. These are formed 
by the heavy surges of this great lake, which rival those of the 
Atlantic. 
From Granite Point tothe east point of the great bay of 
Keewawonan, it is found resting immediately on granite. It 
forms horizontally stratified cliffs along the whole of the south 
east side of the great promontory of Keewawonan. The 
north side of that promontory for many miles to the west- 
ward of its northeast extremity, is of the same formation, 
either stratified like the southeast side, or more generally as 
coarse conglomerate, similar to that of Ile Royale and Nee- 
pigon Bay. Precipitous points of this rock, with sandy bays, 
the beaches of which are formed from the disintegration of 
its particles, continue to the islands of the Twelve Apostles, 
which are also of sandstone. 
From these islands tothe St. Louis, the same formation 
continues, and it is found in cliffs, occasionally, on the north , 
coast 
* See Schoolcraft’s tour for description of the arched rock, 
