Bulletin . 3. A sample tested in the stiff-mud machineworked well in both the brick and the tile dies, and gave a good hardproduct. The shale could probably be used for common brick, hollow brick, anddrain tile. \t would also work for dry-press brick. Indeed it is one ofthe best clays tested from the Piedmont region. PITTSYLVANIA COUNTY. Ledksville Junction.—The Triassic shale at this locality is quitedifferent from the Wolftrap material, for it is exceedingly gritty, and isinterstratified with occasional beds of sandstone, which have to be thrownout in quarrying the shale. The shale is hard a
Bulletin . 3. A sample tested in the stiff-mud machineworked well in both the brick and the tile dies, and gave a good hardproduct. The shale could probably be used for common brick, hollow brick, anddrain tile. \t would also work for dry-press brick. Indeed it is one ofthe best clays tested from the Piedmont region. PITTSYLVANIA COUNTY. Ledksville Junction.—The Triassic shale at this locality is quitedifferent from the Wolftrap material, for it is exceedingly gritty, and isinterstratified with occasional beds of sandstone, which have to be thrownout in quarrying the shale. The shale is hard and does not grind readily, moreover it possesses lowplasticity, and the fact that it could be worked is due to the loamy over-burden being mixed with it. As the eu1 becomes deeper, there would notbe enough of this to mix with the shale. So. on the whole, unless enoughclay is available to mix with the shale, it is not to be regarded as a verydesirable proposition. VIRGINIA GEOLOGICAL SURVEY. PLATE VII. A) Triassic shale in cut, one mile north of Wolftrap.
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