THE WISCONSIN AND 



MENOMONIE 



R I V E R S. 



455 



CANADA 

 SURVEY. 



Messrs. Logan and 

 Murray. 



Section from Gros 

 Cap Range to 

 Manitou Islands 



MICHIGAN 

 SURVEY. 



Dr. Houghton. 



From Lake Huron 

 along St. Mary's 

 River to Gros 

 Cap Range. 



Igneous rocks, Gros 

 Cap range. 



Altered sandstones 

 and conglom 

 rates (Potsdam) 



Trapposc and igne- 

 ous rocks. Gros- 

 Cap. 



Red and Tariegated 

 sandstones (tots 



MICHIGAN 

 SURVEY. 

 S. W. HlOGINS. 



From Mackinaw to 

 Grand Island. 





dam). 



3. 



Trenton. 



3. 





Cincinnati blue 



4. 



limestones and 



Utica slates. 



shales. 



5. 



4. 



Lorraine shales. 



Utica'slate. 



6. 



5. 



Limestoneof Drum- 



Medina sandstone. 



mond and Mani- 



6. 



toulin Islands, 



disturbed by in- 



Limestoneof Mack- 



trusive quartz, 



inaw and Druin- 



and other igne- 



rnond Islands. 



ous rocks. 





Igneous and trap- 

 pose rocks be- 

 neath Lake Su- 

 perior. 



Red and variegated 

 sandstones, base 

 of Grand Island 

 and Pictured 

 Rocks. 



3. 



Upper gray sand- 

 rock. 



Trenton and Birds 

 eye. 



Cincinnati blue 

 limestone. 



Intermediate lime 

 rocks. 



Mackinaw 

 tone. 



MICHIGAN 

 SURVEY. 



Dr. Houghton. 



C. Whittlesey. 



Bay de Noquet to Heads of Oconto 

 Chocolate River. J River to Little 

 Sturgeon Bay. 



I. A. Lapiiam. 



Mihvaukie to Madi- 

 son. Wisconsin. 



Igneous rocks. 



Red and variegated 

 sandstone (Pots- 

 dam). 



3. 



Calciferous sand- 

 rock. 



Birdseye and 

 Trenton. 



Cincinnati bluo 

 limestone. 



Intermediate lime- 

 rocks. 



Mackinaw lime- 

 rock. 



Syenite, granite, 

 and metamorphic 

 rocks. 



Soft saccharoid 

 sandstone, with 

 breccia and red 

 bands. 



3. 



Siliceous lime-roek. 



Bluish-green lime 

 stone. 



Cincinnati blue 

 limestone. 



"WISCONSIN 



SURVEY. 

 D. D. Owen. 



Falls St. Anthony 

 to Keokuk. 



Igneous rocks of 

 Wisconsin River. 



White and gray 

 sandstone (F. 1), 

 Madison, Wis- 

 consin. 



3. 



Lower magnesian 

 limestone (F. 2). 



4. 



Cincinnati blue 

 limestone (F.3, a), 

 Ripley Lake. 



Upper magnesian 

 limestone, lead- 

 bearing lime- 

 rock, Port Atkin- 

 son. 



0. 



Supposed red sand' 

 stone. 



Waukeshaw 

 stone. 



Geodiferous or Nia 

 gara. 



Shaly sandstone. 

 10. 



Corniferous, Lak 

 Michigan, Mil 

 waukie. 



Igneous and trap 

 pose rocks of 

 St. Croix, Rum 

 River, and Mis- 

 sissippi. 



Light- coloured 

 sandstone. Mis 

 sissippi and Wis 

 consin (P. 1). 



Lower magnesian 

 limestone, Mis 

 sissippi and Wis 

 consin Rivers (P. 

 2), embracing 

 red and white 

 sandstones. 



Cincinnati blue 

 limestone (F.3, a), 

 Falls St.Authony 

 and mouth of 

 Wisconsin River 



Upper magnesian 

 limestone (F.3), 

 lead bearing 

 rock. Dubuque 

 Galena. 



0. 



Devonian rocks. 



Coal-measures, 

 Keokuk. 



Mr. Logan does not give the Blue Limestone, but lias what is regarded as its 

 equivalent, the " Trenton Limestone" of New York. The early Michigan geolo- 

 gists separated the Trenton from the Blue, probably as a provisional arrangement, 

 based on lithological difference. 



Let us now bring the comparison to bear on the arrangement of the rocks on the 

 waters of Green Bay. Although I was unable at any point to get measurements 

 for dip, it is evident that the rocks, as a system, plunge away from the great cen- 

 tral uplift of igneous rocks, that is, to the east and south. Along the Neenah 

 River, the dip is slight and irregular, the bedding of the rocks, although frequently 

 well defined, is not traceable in long lines from point to point. 



The general plunge being easterly and southeasterly, we are satisfied, as we 

 progress from the shore of Lake Michigan westward and northwestward, that the 

 rocks that appear to our view are older than those on the Lake. But in the absence 

 of calculations on the dip of these rocks, their thickness cannot be measured, or even 

 estimated with an approach to accuracy. 



The limestone bluffs north and east of Tayhedah, overlooking Lake Winnebago 

 from the southeast, appeared to me the highest rocks of the Fox River Valley, both 



