602 GEOLOGY OP CENTRAL WISCONSIN. 



flUtexta, \S. defleda, Orthis tricenaria, Bhynconella, n. sp., Cypricardites ventricosa, 

 Baphiatoma lenticnlaris, Pleurotomaria suhconica, TrocJumenui, umbilkata, Murchisonia 

 bicincta, M. tricarinata, Orthoceras anellum, 0. vertebrale. 



In the Catfish Valley, the Potsdam, Mendota, Madison and Lower Magnesian are 

 frequently exposed, the last three being quarried at numerous places. A few important 

 points only can be mentioned. O'Malley's and Veerhusen's quaixies in Westport yield 

 very handsome stone, and one quite different from the general run of the Lower Mag- 

 nesian. O'Malley's quarry, S. E. qr. S. E. qr. Sec. 10, shows the following section: 



Ft. In. 



1. Thin bedded to shaly ytUow limestone 6 . . 



2. Three heavier layers of the same . . ■ 2 6 



S. Broken yellov/ limestone with much ooUtio chert (641) and geodic calcite 



(642) 4 . . 



4. Very heavy layers — interstratified with two or three thin layers — of cream- 

 colored, close, granular-textured limestone (640), containing 4.06 per 

 cent, of argillaceous impurities 10 . . 



Prom the heavy layers of No. 4, one of which has a thickness of 24 inches, some 2,CKK) 

 to 3,000 cords have been removed, the stone having been chiefly used in the construction 

 of the State Hospital for the Insane. Mr. Veerhusen's quarry, N. E. qr. of the S. W. 

 qr. Sec. 2-5, is on the top of a narrow ridge of Lower Magnesian, and has a face of 24 

 feet, a large amount of stone having been removed. The following is the section, be- 

 ginning above : 



Ft. In. 



1. Rough, brecciated, yellow, fine-granular limestone (629), containing 3.49 



per cent, of insoluble ingredients; bedding indistinct 8 . . 



2. Very heavy layers, some 4-5 feet in thickness, of pale yellow, close-textured, 



granular Hmestone (626, 627, 628), wliich on solution leaves a large res- 

 idue of fine gray sand, several detenninatione on specimens from dif- 

 ferent parts of the face giving 12.14, 13.03, 20.59, 34.74, 35.63, and 40.78 

 per cents. ; quarry layers 1,5 . . 



3. Greenish sandy layer (6293^); a specimen on solution left 41.17 per cent. 



of very fine gray sand 1 



4. Thinner-bedded hmestone, hke No. 2, but finer-grained, of greenish tint, 



and profusely marked with dendritic oxide of manganese; below the 



base of the main quarry; thickness g g 



The lovi-est layer is 39 feet above the base of the fonnation. No. 2 lias yielded a 

 very large amount of stone for the construction of the Insane Asylum. The stone is 

 Hke that from O'Malley's quarry on Sec. 10, and should have much wider use than foi-m- 

 erly. It is a, much handsomer stone, and endures weathering better than the sandstone 

 used in Madison. The upper and less sandy layers at Veerhusen's have been burned 

 into a good hme. At Westport Station, near the center of Sec. 26, is a long railroad 

 cutting' through the v/^estern end of the ridge upon wlaich the quarry just described is 

 situated. The deepest part of the cut shows the following section ; 



1. Loner MagneskinYimesUm&{%2i%); gray-and-yellow-mottled, porous, mode- 



rately thin-bedded, the layers somewhat broken and displaced; con- 

 tains 11.52 percent, of argillaceous impurities; at base is a thin layer of 

 white ooUtic chert, and another of greensand; in all 20 



2. Madison sandstone, including: thick-bedded, yellowish, fine-gi-ained sand- 



stone (637), with only 2 per cent, of soluljle ingredients, 19 feet; ligliter 

 colored sandstone, 2 feet 6 inches; and purely silicious, white sandstone 

 I often loose, and composed of much roUed quartz grains, 4 feet; in all. . 25 6 



