256 Buell—Geologij of the Waterloo Quartzite Area. 
to have been made in a lecture given by the late Dr. Lapham in 
Milwaukee in 1848.* This lecture probably afforded Dr. Owen 
the data for its first notice in geological literature, which reads- 
as follows: “The late Mr. J. S. Thayer observed a locality of 
granite in Dodge county, Wisconsin, (Sec. 33, T. 9, R. 13, West.) 
It is nearly on a parallel of latitude with Painted Rock on the 
Mississippi and about one hundred miles east of these granite 
ridges on Black river and distant about one hundred and 
twenty miles from the Mississippi and between fifty and sixty 
miles from Lake Michigan.”! The description indi¬ 
cates a complete misapprehension of the nature and 
correlations of the exposures which may be best explained 
perhaps by the indefinite nature of his information. 
In Dr. Percival’s report upon Wisconsin geology made in 
1855, are two brief descriptions of the outcrops. He describes 
the ledges as occurring in two parallel ranges, one on the east 
side of a marsh traversed by Waterloo creek, and the other on 
the west side of a ridge about a mile farther east. He cor¬ 
rectly locates two of the four areas described in this paper and 
associates them with the Baraboo quartzites, but errs in consid¬ 
ering them to be metamorphosed strata of the Potsdam forma¬ 
tion. His determination of the strike of the layers is south by 
east and the dip 20° east, which coincides with my determina¬ 
tions upon his eastern ledge area. 
In the records of the Wisconsin Academy of Sciences brief men¬ 
tion is made of a paper on “The Metamorphic Rocks of Portland 
and Waterloo,” t which was read at one of its earliest meetings 
by the Rev. A. O. Wright. In this the author called attention to 
the rounded and striated surfaces of the outcrops and to the bowl¬ 
der train extending southward from the main area. In the notes 
upon the discussion of the paper is the adoption of a resolution 
that the area be made the subject of scientific examination by a 
committee from the Academy. Apparently as an outcome of 
this is an extended note upon the topic by Dr. Irving which 
was published in 1871 in the American Journal of Science.? This- 
*Dr. R. D. Irving in note in Am. Jour. Science, Vol. V, p. 282. 
■(•Report on the Geology of Wisconsin, Minnesota and Iowa, p. 151. 
^Transactions Wis. Acad. Sciences, Vol. I, p. 189. 
§Am. Jour. Science, Vol V, p. 282. 
