WEST VIRGINIA GEOLOGICAL SURVEY. 599 



Conemaugh Series in the hill above it, which give it their char- 

 acteristic color. The lower clay is principally used for making 

 tile, but is mixed half and half with the red clay for brick. A 

 sample collected from the river clay at the base of the pit 

 shows the following analysis, according to Krak : 



Per cent. 



Silica (SiO 2 ) 65.49 



Ferric Iron (Fe,O 3 ) 5 . 81 



Alumina ( A1,O 3 ) 16 . 42 



Lime (CaO) 0.63 



Magnesia (MgO) 0.46 



Potassium Oxide (K 2 O) 2 . 46 



Sodium Oxide (Na 2 O) . 49 



Titanium Oxide (TiO 2 ) 0. 42 



Phosphoric Acid (PoO 5 ) . 15 



Moisture 2.21 



Loss on ignition 5.55 



Total 100 . 09 



Mr. Flesher has recently opened a test pit in the Pitts- 

 burgh Red Shale, in the hillside south of the plant, a section 

 of which, along with an analysis of the shale, is published 

 under its stratigraphic discussion, page 153. A sample of 

 this shale was shipped to Morgantown, where a mechanical 

 test was made of it by Mr. R. R. Feller, acting under the su- 

 pervision of Hon. A. D. Williams, State Road Engineer, who 

 has kindly furnished it to the Survey, as follows : 



No. 78 Received, Feb. 19, 1915. Name, Pittsburgh Red Shale. 



Date Sample Mixecl, March 26, 1915. Sample not pressed (dried 

 too quick). Put in Kiln, April 9, 1915. Position in Kiln, Top of edge 

 of layer. Time of Burning, 10 days. Temperature, 2400 Fahr. Re- 

 moved from Kiln, May 17, 1915. Kind of Brick, Soft Mud. Color and 

 General Appearance, Red and Hard. Dimensions of Brick, 2%x3%x7^ 

 inches. 



Transverse Test Crushing Test 



Break- Modulus Area Breaking Load 



No. Dimen- How ing of of Lbs. per 



sions Set Load Rupture Section Total sq. inch 



12345 6 7 8 



1 2%x3% Edge 8790 ] 3%x7% 323010 11879 



2 2%x3% Edge 5870 (- 1853 3%x7% 300950 



3 2%x3% Edge 5840 J , 3%x7% 249170 9015 



4 2%xS% Edge 4800 { 1535 3%x?y 2 256790 9132 



5 2%x3% Edge 6510 J 3%x7% 252950 8996 



