STATE GBOLOGIS 2M 



circulation of the water, in these strata, prevent it from linking, 

 in these elevated sections, to the level of the lowest portions ol 



tin- l.asin in remote parts of the State, As a arte- 



sian borings mighi prove successful throughout tly southern 

 halt* ot Jackson county, end the eastern portion of Calhoun, if 

 inued down to the bottom of either of tb ips. 



It must Dot be supposed, however, that the n wells of 



ipplied from this Bonrce. U 1 hav< '■ d iu 



the identification ol ka in that vicinity, these wells are 



supplied from the Parma Sandstone Albion is outside of the 



■nation, and the wells there have to be C Dtinued 

 i iwii to the ho. torn of tije Nap Sandst me. M ushall is 



outside of the rim of this, and rests just upon the rim of the 

 outcropping Marshall Group; and hence 1 >!■ ild uot ex peel 



that the contained waters would rise t I the U 



sian (salt) wells of Grand Rapids arc supplied from the Napo- 

 leon Group, the water being salted frmn the group immediately 

 The wells at Saginaw issue from the same sandstones, 



and are salted in the same way. In the southern part of Jack- 

 son ami northern part of Hillsdale counties, where the streams 

 have cut through these rocks, the contained waters rush out in 

 led chains of most beautiful and copious springs of pure 

 \ Irian is located upon the argillaceous strata of the 

 Huron Group, and the first water-bearing stratum which would 

 1 is included in the lionroe limestones, perhaps 250 

 below. But the surface Blopes gradually toward Lake 

 Erie, so that the hydrostatic pressure would not be adequate to 

 an artesian overflow. Ann Arbor is supposed to lie within the 

 !' the Marshall and Napoleon sands! ines, but the consider- 

 able : of this place precludes all expectation of an 

 m. Tb B wells at Toledo do not reach the solid 

 rock at all, th .ugh this h is been unsuccessfully expl >red to a 



Lepth. The alluvial depositee, which are h 

 great are made np of alternating sandy ami argill* 



. lually toward the bed of the lake, and of 

 2f, 



