Headden — Brown Artesian Waters of Costilla Co., Colo. 315 



Analyses of Residues from Artesian Wells. 



Mosca. Town well Mosca. Mill well Hooper Mill well 

 500-600 feet deep.* 780 feet deep. 750 feet deep. 



Carbon 0-365 



Si0 2 _. ,. 5'537 



S0 3 0-342 



CI 0-425 



P„0 5 0-247 



C0 2 37-603 



Na 9 0_.... 53-077 



K 2 G 0-982 



CaO 0-413 



MgO 0-153 



Fe 2 3 0-086 ) 



A1 2 3 0-121} 



Mn 3 4 0-086 



Li, I, Br ... . I , Li, etc. plus 



TiO„.BO .. h eactltiace Ore.m 



99-437 

 = C1 0-096 



4-821 









4-160 



0-046 









0-063 



0*284 









0-470 



0-148 









0-168 



37-104 









37-365 



53-665 









54-045 



1-148 









1-433 



0-651 









0-282 



0-391 









0-219 



0-031 









0039 



0054 









0048 



LS 



Li 



, etc. 



pi. 



IS 



>r [1-721] 



Oi 



■g. matter [1.814 



100-064 









100-106 



0064 









0-106 



99-341 100-000 100-000 



* This residue was heated till the organic matter was charred but not 

 wholly destroyed. The deficit of 0'6597 in the analysis is probably due to 

 organic matter. 



If this water is characteristic of a subordinate basin inde- 

 pendent of the rest of the valley, as I at one time thought, it 

 is peculiar that we have no area surrounding it barren of 

 artesian water. Further, that they have not succeeded in 

 getting below the water carrying sodium carbonate in solution. 

 There is no indication, of which I have been able to learn, that 

 they have approached the downward limit of the sodium carbon- 

 ate. The deepest well in this section, whose waters I have 

 analyzed, was 880 feet deep and this water was the richest of 

 all I have examined in sodium carbonate. On the other hand, 

 if it forms a part of the general basin and there are no changes 

 in the inclination of the strata, it is hard to see how the lateral 

 limits of the sodium carbonate can be so sharply defined. There 

 can certainly be no general lateral movement of the waters 

 through the valley in which this water participates. Such a 

 movement is possible, but it must take place at a greater depth 

 than has yet been attained by the wells of this section. The 

 floor of this valley has not, to my knowledge, been reached by 

 any of the drill holes. The sheet of lava forming a portion of 

 the southern margin of the valley is of later origin than some 

 of the sedimentary strata and is evidently no part of the real 

 floor of the valley. 



Fort Collins, Colorado. 



