oecupy from the mouth of Pigeon river to Pt. aux 
The fine-grained sandstones of the southern part of the state 
are overlaid by the saliferous and gypsiferous clays of the 
“Michigan Salt Group,” attaining a thickness of 184 feet at 
Grand Rapids and Saginaw, but in Jackson county attenuated 
to less than 50 feet. They are underlaid in Branch, Calhoun, 
stones are traceable to the shore of Lake Huron, which they 
Barques. 
St. Joseph and Van Buren counties, by a considerable thickness 
Carboniferous limestone, .sesvoeesveesnserebowrcseese 66 feet. 
Michigan Salt Group, .+--+eee+eeeereeeeee? Bee aes 184“ 
Apoleon Group, severe roeee® £ ee PE Ko Eke wee re ees F 123 jc 
Shaly micaceous sandstone, ++. ++ +++ +++-9* 15 4 
a ? sas pe’ 7 
TOCRHUOK cic venience -euseronseer rts * 78 ; 
(? oes micaceous retry eo: ve eee 7 r 
a) Clay and shale, more than -.----++-++++-° 
Marshall roars eee ures eee 173 
@) Reddish, yellowish and greenish sandstones,.. 147 c 
¢) Shaly, micaceous sandstone, ---+++-++++*"* 10 : 
b) Conglomerate, ....+-++eeeereerree tte 2 . 
a) Fine, bluish gritstones, ...++++++-+***-*** 1 
Ax. Jour, Sot.—Szconp Series, Vou. XXXII, No. 99.—Mary, 1862. 
45 ; 
