APPENDIX. 



553 



Section for Southern Michigan. 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 



Glacial drift, etc. 



0-600 



Gravel, sand, and clay. 



a 



o3 



*"— u ncun/urmuy ^^^^ 



Woodville sandstone. 



304 + 



Gray sandstone grading into blue shale ; layers 

 of fire-clay. 



9 



> 



GO 



a 



Jackson Coal (or Sagi- 

 naw) series. 



Possible unconformity 

 . Parma? sandstone. 

 ~— Unconformity ■^-~~~. 



Grand Rapids series. 



47 ± 



Sandy shales of various colors, with layers of 

 fire-clay and beds of coal; charged with 

 iron pyrites; principal coal horizon of Michi- 

 gan. 



Ph 



0-200 



Porous and saturated with brine. 





305 ± 



Limestones, underlain or replaced by shales 

 and dolomite with gypsum. 



'a 



Marshall sandstone. 



50 ± 



Contains brine. 





Cold water shales. 



667-1000 + 



Blue arenaceous shales, with seams of fine- 

 grained sandstone. Balls of kidney iron 

 "ore" in some layers. 





Richmondville or 

 Berea sandstone. 



65 



Contains brine in large amounts; signs of oil 

 and gas. 





' Antrim (St. Clair) 

 Black shales. 



145-300 



Often bituminous. 



d 



'2 



o < 



> 

 Pi 



Traverse group. 



100-600 



Some limestone in reefs, some dolomite, much 

 blue argillaceous limestone, shales; signs of 

 oil and gas. 





Dundee limestone. 



40-160 



Light-colored limestone, containing mineral 

 water; some oil and gas. 



d 



03 



aS 



Monroe formation. 



650-2000 



Dolomite, with rock salt, gypsum, and glass- 

 sand; brines and mineral waters. 



L Niagara formation. 



350 + 



White dolomites and limestone. 



d 



' Lorraine and Utica 

 formations. 



600 



Blue and black shales, with some limestone. 



c 

 C 



[ Trenton limestone. 



? 



Dolomite and limestone, somewhat oil-bearing. 



1 Lane. Geol. Surv. of Mich., Vol. V. Plate 

 Michigan in Geol. Surv. of Mich., Vol. VIII. 

 Monroe. 



LXXIII, adjusted to nomenclature of Geological Map of 

 Section based largely on well-borings at Jackson and 



