298 GEOLOGY OF EASTERN WISCONSIN. 



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

 the 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 this, in Sec. 11, N, 

 W. qr. of S. W. qr., the transition stratum is better shown, tog-ether 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 

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

 is especially crowded with Leperditiafabulites, the heavy Lower Buff beds in full, and the 

 Lower Blue beds, may be seen in magnificent vertical exposure. 



A partial analysis of chippings from the entire thickness 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 lime, etc., by estimate 52.63 47.97 



Total 100.00 100.00 



In a ravine a little 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 Bluo 

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

 minor openings along this line of bluffs display limited sections. A mile or more to the 

 southeast, at Carpenter's quarry, on the line 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 building- 

 stone. The ravine below this quarry has gullied into the Lower Blue beds, and show.s 

 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.-, 

 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 



Carbonate of magnesia 34.86 43.87 



Carbonate of lime, etc., by estimate 48.54 49.30 



Total 100.00 100.00 



A mile and a half farther southwest, Hess 1 quarry appears to lie across 

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

 latter being especially prolific 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 



