"I found Mr. Keating's account of the Mississippi, and especially of the
St. Peter's, most surprisingly erroneous, and old Jonathan Carver's
book, which he is constantly denouncing, _very accurate_.
"I ascertained, to my perfect satisfaction, the termination of the
horizontal beds of sandstone of carboniferous limestone formation, and
came upon the outcrop of the adjacent granite, just where I expected to
find the primary rocks."
"You will greatly oblige me by communicating to me your opinion,
approximatively, of the course held by the primary rocks south of Lake
Superior, as far as you are acquainted with it, or with the edges of the
secondary rocks, which have a junction line with, or near them. I found
no primary rocks on my way from Green Bay to Prairie du Chien. The rocks
in place at Fort Winnebago, are secondary sandstone of the
carboniferous series."
_2d_. The question of "inscriptions" on rocks by the aborigines has
recently attracted some attention. Dr. Thomas H. Webb, of Providence,
Rhode Island, in a letter of this date, notifying me of my election as
an honorary member of the Rhode Island Historical Society, calls my
attention to this subject.
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