514 LOCAL SECTIONS 
7. Slope, where rocks concealed, . 40 
8. Hard, brown sandstone, in thin beds, Gneanies cslbaeene and magnesian, 8 
9. Slope, with occasional ledges of coarse- i soled sandstone protruding in 
massive beds, : : : : ‘ 73 
5 
10. Lower Magnesian iimaunonsy F. 2, 
Total, a 
Bed No. 6 splits with a conchoidal fracture, and has cavities partially filled 
either with concretions of iron or blende. It has the lithological character of the 
Trilobite-bed on Lake St. Croix, and contains the same Lingulas. 
From the above section it appears that on this part of the Wisconsin thick- 
bedded brown and white sandstones, containing but a few fossils, take the place of 
the coarse Lingula and Obolus grit, F. 1, ¢, of the Mississippi sections; and the 
same fact will appear from some of the succeeding sections. 
For about fourteen or fifteen miles above Helena, no good sections present them- 
selves. 
On Section 20, Township 9 north, Range 6 east, of the 4th Principal Meridian, 
the following section was measured. 
1. Soft, white sandstone, passing upwards into coarse, eit gritstone, . 60 
2. Coarse sandstone, composed of angular grains of quart 1 
3. Brown, compact, calcareo-magnesian rock, with erie beds of pial 
‘sandstone, . , ; : ; : 35 
4. Brown sandstone, a beanlarreindo ed, 5 
5. White and brown sandstone, sutenstrntitied oh ice oplcaruo-nagn > 
sian rock, like the beds of No. 8, but more arenaceous; some grecn- 
sand disseminated, 87 
6. Partial exposures of sguditind} bind thin layers ot aagneatau facade! 26 
7. Slope, covered with vegetation and soil, and masses of brown Appaies 
sandstone, . : ; ; 48 
Total, ’: : : 265 
The sandstone at the bottom of bed No. 1 is exceedingly white, being composed 
of limpid grains of quartz, loosely cemented, so that with a slight blow it crumbles 
easily to a white sand; the upper beds of No. 1 resemble the coarse Lingula grit 
of Lawrence Creek. 
Bed No. 2 contains small, rounded, and angular concretions of ferruginous sand, 
and some particles of silicate of iron and ferruginous stains. 
Bed No. 3 probably corresponds to the brown Orthis rock, No. 3 of the hes at 
La Grange Mountain. Bed No. 6 has the lithological character of bed Nass 
the La Grange Mountain section. 
Two miles below Saukville, the hills near the river seem to be composed mostly 
of drift materials. 
Nearly opposite Saukville, the hills are a little over two hundred feet high, and 
present the following section : 
