State Museum 



Plate 5 

 Bulletin 77 



H. P. Gushing, photo. 



Quarry face at bridge north of Ingham's Mills, showing 10 feet of Low- 

 ville (Birdseye) limestone at base, followed by 8 feet of thin black lime- 

 stone bands with shale partings, of Black river age, and capped by 5 

 feet of Trenton limestone. 



