160 THE GEOLOGY OF MINNESOTA. 



[Dolomites. 



the following, located at Stillwater, viz., the Irish Catholic church and the 

 State Prison (both with trimmings of Kasota stone, No. 23), the public 

 schools, the Holcombe block, the store of Isaac Staples, the Universalist 

 church, and others ; the Marsh block, the Phalen and the Torinus blocks. 



At Red Wing this formation is more used for quicklime than for build- 

 ing stone. The principal quarries are owned by Dr. W. W. Sweeney in Barn 

 bluff, R. L. Berglund and G. A. Carlson. The quarry of Dr. Sweeney was 

 opened in 1865, and has been in constant use from that time to the present. 

 That of Mr. Berglund was opened in 1868, and Mr. Carlson's somewhat later. 



The stone obtained at Red Wing from the quarries exhibits the same 

 kind of alternation of strata as that which has been described at Stillwater, 

 except that the vesicular beds are somewhat more siliceous, and at the same 

 time not so coarsely porous, which renders the whole product of the quar- 

 ries somewhat better adapted for construction than that of the quarries at 

 Stillwater. At Red Wing the aggregate thickness of the St. Lawrence 

 formation is about 120 feet, in which there is much excellent building-stone, 

 some layers being five feet thick. Pieces of any size, limited only by con- 

 venience of handling, can be got out, and some of it is very conveniently 

 quarried in the form of flagging. The quarry of R. L. Berglund, situated in 

 a bluff near Oakwood cemetery, furnished stone which has been cut into 

 rounded columns for the fronting in a block on Bush street, between third 

 and fourth. They are ten feet long tapering from about a foot to about 

 nine inches in diameter. The porousness of the rock makes only a bush- 

 hammer dressing suitable, but these columns show that the rock is adapted 

 to a great range of architectural uses. The stone in the Catholic church 

 at Red Wing came from the quarry of Mr. Berglund, and the stone in the 

 Episcopal church from Mr. Carlson's in Sorin bluff. The Red Wing and 

 the Diamond flouring mills are built of the Red Wing stone ; also the piers 

 of the railroad bridge at Hastings. 



The rock obtained at Frontenac (No. 13), known as the Frmi/i'tiac sfoiic 

 is light buff, and evenly and finely vesicular, in heavy beds of five feet and 

 less. It was formerly obtained in the N. W. J Sec. 21, T. 112, R. 13, Florence. 

 But now it is quarried near lake Pepin, at Frontenac, from near the bottom 

 of the St. Lawrence formation, 110 feet below the top of the bluff. The 

 perpendicular exposure of the beds in the bluff amounts to sixty-six feet. This 



