298 GEOLOGY OF EASTERN WISCONSIN. 



At Clute's point, near the east line of Sec. 10, town of Beloit, about four miles nortt of 

 tlie city, the upper portion of the St. Peters sandstone and the lower part of the calcare- 

 ous transition bed is shown. About a quarter of a mile southeast of tliis, in Sec. 11, N, 

 W. qr. of S. W. qr., tlie transition stratum is better shown, together with the layer of 

 sand above and the bottom layers of the Lower Buff beds. About an equal distance 

 further south, near the high bluff that overlooks the river, cherty layers, B, I, and a por- 

 tion of those above are shown. The latter partake quite decidedly of the characteristics 

 of the Galena limestone, and are less shaly than usual. Passing over the high hill to a 

 ravine on its southwest flank, the Galena limestone and some of the upper transitional 

 layers may be found. Nearly a mile further south, at the large quarry near the C. & 

 N. W. R. R., a portion of the St. Peters sandstone, the calcareous transitional layer, the 

 interstratified layer of sand, the shaly layers of the Lower Buff limestone, one of which 

 is especially crowded with LeperditiafabuUtes, the heavy Lower Buff beds in fuU, and the 

 Lower Blae bods, may be seen in anagnificent vertical exposure. 



A partial analysis of chippings from the entire tliickness of the Buff' and Blue layers 

 at this point, exclusive of the thin ones at the base, shows the following composition: 



Buff. Blue. 



Insoluble residue 5.74 10.29 



Soluble silica 1 . 96 1 . 75 



Sesquioxide of iron and alumina 3.27 1.60 



Carbonate of magnesia 36.40 38.39 



Carbonate of hme, etc., by estimate 52.63 47.97 



Total 100.00 100. OO 



In a ravine a httle south of this the upper part of the Lower Buff and the lower part 

 of the Lower Blue beds are shown in a small quarry. Still further south along the rail- 

 way, another large quarry exhibits a considerable portion of the Lower Buff and Blue 

 beds, and below, near the track, the St. Peter sandstone is slightly exposed. Several 

 minor openings along this hne of bluffs display limited sections. A mile or more to tiie 

 southeast, at Carpenter's quarry, on the hne between sections 26 and 27, the lower por- 

 tion of the Upper Buff beds — B. V, IV, III and a portion of II, of the preceding sec- 

 tion — are extensively wrought, the lower beds especially being a desirable bmlding- 

 stone. The ravine below this quarry has guUicd into the Lower Blue beds, and show^i 

 their character wherever subjected to the full action of atmosphere, frost, and water. 



A partial analysis of the strata B. V and B. IV, at Carpenter's quarry, shows their 

 chemical nature to be as follows: 



,— Upper Buff.—s 

 B. IV. B. V. 



Insoluble residue 12.50 3.42 



Soluble silica 1 .87 1 .99 



Sesquioxide of iron and alumina 2.23 1 .42 



CarVjonate of magnesia 34.86 43.87 



Carbonate of hme, etc., by estimate 48.54 49.30 ' 



Total 100.00 100.00 



A mile and a half farther southwest, Hess' quarry appears to lie across tlie layer 

 marked B. II, in the section, and to include some of the layers above and below, tho 

 latter bemg especially prohfic in fossils heretofore classified as characteristic of the Buff. 

 At Hanchett's quarry, a short distance south of this, the present exposure reaches from 

 about three feet below the bed marked B. IV, to about the top of B. II. A little over 



