Rock, Random determination of:

     All the rock types are listed on the following random determination chart. This chart is merely for rolling up a random rock type:

 

%Roll: Rock types:
01-15:   Granite
16-29:   Lava (basalt rock)
30-33:   Limestone
34-47:   Marble
48-61:   Pumice
62-75:   Sandstone
76-00:   Shale