550 THE GEOLOGY OF MINKESOTA. 



[Water analysis. 



approximating to a direction perpendicular to the ice-border. That the strife bearing S. 35 P "\V. 

 belong to a later date than those from north to south, is made quite certain by the fact that the 

 former is approximately the prevailing course of striation in this region; for the last glacial erosion 

 upon any area must obviously efface the greater part of the earlier striae. 



"About a mile farther north, perhaps in the southeast quarter of section 15, Mound, on a sim- 

 ilar small, low exposure of quartzyte, also only one rod east of the same road, similar striation was 

 observed, the larger (west) part of this exposed rock-surface being striated from north to south; 

 and the smaller (east) portion, S.35 W. A slight difference in slope of these _ ,. M . t . $ , 







differently striated portions of the rock surface is also seen here, forming a bev- 

 eled angle (fig 45). These observations agree in all respects with the preceding."* 



Natural waters. The water of the Rock river at Luverne was examined chemically for 

 the survey by Dr. W. A. Noyes in November, 1882, with the following resultsif 



Analysis of the water of Bock river. Chem. Series No. 133, showing the composition of the 



residue from evaporation. 



Parts per 1.000,000. Percentage. Grains per gallon. 



Silica, SiO 2 .............................. 21.0 7.6 1.22493 



Alumina, A1,O 3 .......................... 1.0 .4 0.05833 



Iron oxide, Fe 2 O 3 (?) ..................... 8.8 3.2 0.51330 



Calcium carbonate, CaCO 3 ................ 136.0 49.6 7.93288 



Calcium sulphate, CaSO 4 ................. 6.4 2.3 0.37332 



Calcium nitrate, Ca(NO 3 ) 2 ............... traces 



Magnesium carbonate, MgCO 3 ........... 70.4 25.7 4.10643 



Lithium phosphate, Li 3 PO 4 ........ minute trace 



Potassium sulphate, K 2 SO 4 ............... 3.3 1.2 0.19249 



Sodium sulphate, Na 2 SO 4 ................. 25.6 9.3 1.49325 



Sodium chloride, NaCl ................... 2.0 .7 0.11666 



204.5 100.0 16.01159 



Iodine and bromine were absent, as well as borates; the test by permanganate showed 1.1 

 parts of oxygen consumed by organic matter for each million parts of water; hardness, 17 degrees. 

 This water is notable for the large amount of iron. 



Springs. A spring that issues from the base of "the mound" on Mr. Lary McDermott's 

 farm, is said to supply soft water. This can only be accounted for by supposing the water to 

 pass only through the strata of the Potsdam formation, which in some places is quite open and 

 pervious; since the drift deposits of the county, as well as the strata of the Cretaceous (if such 

 exist in these counties), will only supply a hard water, and also very often one somewhat alkaline. 

 Springs, from whose calcareous matter the peculiar deposit of travertine called "petrified moss" 

 is being formed, occur on the northwest side of Chanarambie creek, in section 22, Osborne. Other 

 springs, notably ferruginous, occur near by, and similar springs are found occasionally along 

 Chanarambie creek for several miles above this point. 



Two remarkable mineral springs, supposed to contain sulphur, occur about a quarter of a 

 mile northwest of the east branch of Split Rock creek, on the S. E. \ of section 20, Eden. 



Wells in Pipestone county. % 



Bock. John Hipes; S. E. } sec. 4: well 20 feet; soil, 2; yellow till., picked, 18; water seeps. 



Burke. The railroad well at Woodstock station, in the S. VV. J of section 2, was dug S4 feet, 

 and bored 18, to a total depth of 72 feet; it was yellowish till for the first 40 feet, below which it 

 was all darker, bluish till. The only water obtained seeps within the first sixteen feet from the 

 surface, and fills the well to within ten feet, and sometimes within six feet below its top, but does 

 not yield a large supply. 



Osborne. 3. B. Barlow, Jr.; Edgerton, in the N. E. J of sec. 28: well dug to 40 feet, and 

 bored 25 feet, to 65 in total; soil, 2 feet; sand and gravel (modified drift in the valley of Rock 

 river and Chanarambie creek, on a terrace of which Edgerton is built), 16 feet; blue till, spaded 



*See also page 504. 



tEleventh annual report. 



;Mo:-t of the notes on wells are by Mr. Upham; and many iu Hock county are from Mr. Aaron Baer, of Luverne. 



