Bulletin . (A) Residual clay near Louisa. M&£$3& *v~ ?: - f \ ka. - *- r. *1*J? - ual clay containing limonite near Pittsville. pre-cambrian crystalline schists and gneiss clays. bo Comments on the Table. The residual clays derived from the pre-Cambrian granites and gneissesaxe mostly of good plasticity, so that they can be molded without difficulty,some of them working well in the stiff-mud machine. They also burn to agood color. Many of them could be used for the manufacture of commonbrick and some of them for hollow tile. PRE-CAMBRIAN CRYSTALLINE SCHISTS AND GNEISS CLAYS. There is one irreg
Bulletin . (A) Residual clay near Louisa. M&£$3& *v~ ?: - f \ ka. - *- r. *1*J? - ual clay containing limonite near Pittsville. pre-cambrian crystalline schists and gneiss clays. bo Comments on the Table. The residual clays derived from the pre-Cambrian granites and gneissesaxe mostly of good plasticity, so that they can be molded without difficulty,some of them working well in the stiff-mud machine. They also burn to agood color. Many of them could be used for the manufacture of commonbrick and some of them for hollow tile. PRE-CAMBRIAN CRYSTALLINE SCHISTS AND GNEISS CLAYS. There is one irregular but important belt or area of rocks of this sub-division of the pre-Cambrian. It enters the State in Fairfax County, and crosses parts of PrinceWilliam, Culpeper, Stafford, Orange, Spottsylvania, Louisa, and Fluvannacounties. It then widens out in Buckingham, Appomattox, Prince Edward,Campbell, Charlotte, Halifax, and Pittsylvania counties. A broad tri-angular area including parts of Grayson, Carroll, Patrick, Floyd, Franklin counties lies on the
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