How did Granite form?
A. The formation of granite began 325 million years ago as a large, hot (1300 to 14000 degree farenheight) mass of magma – molten rock. This magma oridinated when some of the eath’s crust melted – probably at a depth of about 11 – 12 miles. The magma rose upward and came to rest close to the earth’s surface. There it cooled very slowly – taking over a million years – and solidified into granite. That was over 300 millino years ago. Since then, the granite has pushed upward, and the land above it has been moved by erosion. The result: Now the granite lies right at the surface where it can be easily, safely, and economically quarried.
