3.^ 



Table 2J. — Carbon dioxide in llw different sections from the tire fields on 

 C arrington loam. 



loam, where they are ahke for the two drifts. On the older formatioi? 

 the carbonates have been leached out to a depth greater than three fee? 

 on the two Carrington series. No serious leachinq- has taken place on 

 the Farcfo silt loam on either drift. On the Late Wisconsin an appre- 

 ciable amount is found in the third foot on the Carrington silt loam, but 

 practically all has been leached out of the first three feet on the Car- 

 rington loam. 



Field V on the Kansan and Field I on the Late Wisconsin, on the 

 Fargfo silt loam, show a carbonate content radically different from the 

 four other fields on their respective drifts, well illustrating- the fact 

 that samples from a single field cannot safely be assumed to be repre- 

 sentative of a particular type in any given area. 



Table 24. — Carbon dioxide in the different sections. The data are averages 

 for the five fields reported in column 7 of tables 3i, 22 and 2^. 



Carrington silt loam Fargo silt loam Carrington loam 



Depth Kansan Late Wis. Kansan Late Wis. Kansan Late Wis. 



Inches per cent per cent per cent per cent per cent per cent 



1_ 6 0.077 0.076 0.314 0.511 0.072 0.082 



7—12 0.082 0.052 0.194 0.540 0.054 0.061 



13—24 0.057 0.130 0.059 530 0.053 0.042 



25—36 0.034 1.066 0.828 1.037 051 0.052 



Average 



1—36 .0.057 0.420 0.380 0.697 0.056 0.055 



