BULL. GEOL SOC. AM. 



VOL. 17, 1905 PL. 72 



Figure 1. — Cook's granite Quarry, north of Petersburg, Virginia 

 Showing horizontal jointing parallel to surface 



Wm 



Figure 2. — Inclusion or Gneiss in blue Granite at McGowan Quarry, south of Richmond 

 GRANITE QUARRY AND GNEISS INCLUSION 



