97 



linear bas in 



f which I had 

 means at my uisp. sal have 

 ufficicnt to enabl< 

 iug them In the mean time there is little doubt that the rocks 

 of the Miehig Qroup outcrop in abroad belt arcliing 



northward ua Bay through Ogemaw, union, 



II ikee, Wexford, ] The intcr- 



. it explorations be made across this 

 irly a da;. ible. IT the indications ol 



tnd verified, this res >urce will prove of incalculable 

 value to the central d insula, at present cut 



11 ready c d with otl 



•me claj en at the 



mouth river, in Huron county, which very much re- 



f the Salt Group; and as this is about the place 



for the formation to strike the main .in, after crossing 



y, there are reasons for undertaking some more thorough 



in that vicinity. Indicati exist of the 



occur nation in Tuscola county. It is likely, 



rroup thil ward the south and nearly 



. Oakland, Washtenaw, Jackson and 



Baton s, thus furnishing another illustration of the 



thickening of our formati ml tie- north. The salt springs 



at Saline, in W w c >unty, and at various points in Jack- 



ntative of 

 the group; hut I am more inclined to- think that these waters, 

 similar onea in Branch, Oakland, and the northern part of 

 t county, >lied by the v irmations outcrop- 



rings for salt have Bhown the Napo- 

 . while at Saginaw, 

 I at 1° of th' s ter in 



I : ■ Ing the Parma 



rtant to bear in mind that the occurrence 

 of a brine spi ■'. than that th 



somewhere in the State. 



la 



