516 



LOCAL SECTIONS 



Five miles above Plymouth, on the southwest corner of Section 28, Township 11, 

 8° east of 4th Principal Meridian, the bluffs come up to the river, and afford a good 

 section, here given : 







Feet. 



1. 



Talus, ......... 



5 



2 



Coarse brown gritstones, with ferruginous concretions, . 



5 



o 

 o. 



Soft, crumbling, coarse, brown sandstone, .... 





4. 



Fine-grained, brown sandstone, with ferruginous concretions of the same, 



5 



5. 



Slope, rocks concealed, ....... 



88 



6. 



Lingula and Obolus grit, white below, anil thinly-laminated above, 



5 



7. 



White sandstone, with small pebbles of quartz and felspar, 



4 



8. 



Coarse brown sandstone, " " " " . " 



5 



9. 



Thick-bedded, light-coloured sandstone, .... 



6 



10. 



Brown, calcareo-siliceous rock, containing two species of Orthis, 



4 



11. 



Coarse, ferruginous sandstone, with small pebbles of quartz, 



4 



12. 



Brown, calcareo-magnesian rock, with numerous columns of Crinoidea, 







green specks, and thin bands of brown sandstone, intercalated, 



12 



13. 



Brown, mottled sandstone, with intercalations of white sandstone, 



24 



14. 



Slope, no rocks exposed, ...... 



181 





Total, 



363 



The slope No. 5 probably contains crumbling beds of green Lingula gritstone ; if 

 so, one hundred and twenty-three feet of the base of the section represents F. 1, c, 

 of the Mississippi sections, though not quite so fossiliferous as on that river. Bed 

 No. 6 contains some pebbles of quartz and felspar as large as a walnut. No. 10 of 

 this section corresponds to No. 3 at La Grange Mountain. No. 13 effervesces freely 

 with acids, and is the most suitable for making lime. 



Four miles above the last section we found another, as follows : 



Feet. 



1 . Coarse Lingula grit, and white and brown sandstone, ... 60 



2. Slope, no rocks exposed, ...... 83 



3. Brown, calcareo-magnesian rock, with remains of Crinoidea, . . 10 



4. Fine-grained, soft, brown sandstone, ..... 9 



5. Slope, no rocks exposed, ...... 20 



Total, . . .182 



The Lingula grits of this section form a wall on the river, scooped out at the 

 base, so that the upper beds overhang the water. The Crinoidal beds are very 

 nearly on the same level here as at the preceding section. Two miles higher up the 

 river, the Lingula grit-beds are seen in a mural cliff of fifty feet. The sandy soil 

 above supports a growth of pine and oak. 



A mile above, the hills are one hundred and fifty feet high, with the same wall 

 of Lingula grits at the base, on the river. This point is about one mile below De- 

 korra, where the sandstone is seen in cliffs of sixty-five feet. 



Immediately below the mouth of the Barraboo River, the hills of drift are seventy 

 feet high, and composed of sand, gravel, and small boulders ; near Winnebago Por- 

 tage, they are twenty-five to thirty feet. Between these two localities the Wiscon- 



