SECTION II.. What Is the Most Abundant Plutonic Rock?

What is the most abundant plutonic rock?

How is its thickness ascertained?

What is its amount?

Where is it found?

What is its ordinary structure?

What peculiarity of structure facilitates the cleavage of granite?

The granitic masses are generally deep below the surface; in what other position does granite appear?

In what classes of rocks are granite veins found?

Were they all produced at the same time?

How is this demonstrated?

What is the relative position of the older and newer granites?

What other plutonic rocks occur in considerable quantities?