STATE OEOLOGIS 



(a) Low - r of the al ve localities. 



- below. 



12. lifichigan Salt Gi tp, I 



(c) ( and pyri- 



toua marls. 

 (^6) S marl, magnesian and Bilicioua Limestone, and 



thick I gypsum. The shales impregnated with 



(a) Saliferone shales and alternating arenaceous limesi 

 11. Napoleon Group, 123 feet: 



(d) ShsJy micaceous sandstone, 15 feel 



(c) Napoleon sandal foot, highly ssliferous in many 



localities; Napoleon, Grandville, Rush lake, Pt. aux 



Barques. BVMS 



(6) Shaly micaceous sandstone, 15 feet: Salt boring 

 (a) Clay or shale, 15 feet, [more than 04 feet at East Sagi- 

 naw (?) ] 



III. DEVONIAN SYSTEM. 



10. Marshall Group, (Chemung,) 159 feet: 



(c) Reddish, yellowish and greenish sandstones, 147 feet: 



Marshall, Jonesville, Hillsdale, Battle Creek, Holland, 



Pt aux Barques. 

 (6) Shaly micaceous sandstone, 10 feet: Jonesville, &c. 

 (a) Conglomerate, 2 ft.: Grindstone Quarries, Pt. aux Barques. 



9. Hur "), 224 feet: 



(d) Fine bluish gritstones, 14 feet: Pt aux Barques. 



(c) Shales, limes! 1 flagstones, 18 feet. The Kidney 



6f Branch county are supposed te belong 

 he; . - Lake liuiuii, hel-»w Pt aux Barques; 



Branch, Calhoun, Kalamazoo and Lenawee counties. 

 (6) Green shale, 10 led: Grand Traverse Bay. 

 (a) Black bituminous shale, 20 feet. Sulphur I [uaw 



Pt . Grand Travel 

 8. Hamilton 55 fee : 



(c) Crystalline li ■. with included lenticular clayey 



l't., Little Tra\. 



(6) Argillaceous liny i minently fosailiferoas, with al- 



1 ft: Pari 



(a) Black 1 



• a; Thunder tie Tia\ 



7. I" ■ • 



