1. Long tensional faults give the Basin and Range province what distinctive
landforms? (see p. 260)

2. When did the current episode of extension (creating the Basin and Range)
begin?

3. Locate the Wells Formation and the Phosphoria formation on the figure on p. 260.

a. When were these two formations deposited?

b. What rocks make up the Phosporia Formation?

c. In what sort of environment were the rocks formed?

4. What is a listric fault?

5. On the High Lava Plains of Oregon, when and where was the earliest
volcanic activity?

5. When did the eruptive life of Newberry volcano begin?

6. How does diatomite form and what is its most familiar use?