Note: Radiometric ages have been determined for a number of igneous and metamorphic rock units in this area. Rock Age (Ma*) Basalt flow 34.3 Volcanic Breccia 35.4 Diorite 70.2 Granite 220.0 Gneiss 815.0 *Age in Ma, millions of years. Questions in this section: Mark the best answer to questions on the geologic history and contact relationships of the Hutton Gulch area. Multiple Choice 1. The contact between the granite and the gneiss represents what type of contact? a. intrusive contact. d. angular unconformity. b. fault (tectonic) contact. e. disconformity. c. nonconformity. 2. Which rock unit is the oldest in this cross-section? a. Diorite c. Granite b. Basalt d. Gneiss e. Breccia 3. What principle allows you to best distinguish the age relationship between the gneiss and the diorite? a. law of superposition d. cross-cutting relationship b. law of original continuity e. principle of inclusion c. law of original horizontality 4. The granite cuts across the gneiss, what other principle allows you to distinguish the age relationship between the gneiss and the granite? a. law of superposition d. principle of inclusion b. law of original continuity e. faunal succession c. law of original horizontality 5. The contact between the gneiss and the overlying fractured sandstone represents what type of contact? a. intrusive contact. d. angular unconformity. b. fault (tectonic) contact. e. disconformity. c. nonconformity. 6. If you were uncertain of the type of contact between the granite and the overlying fractured sandstone, which principle would allow you to determine it’s nature? a. law of superposition d. principle of inclusion b. law of original continuity e. faunal succession c. law of original horizontality 7. What type of contact exists at the base of the cross-bedded sandstone? a. conformable depositional c. nonconformity. contact. d. angular unconformity. b. fault (tectonic) contact. e. disconformity. 8. What type of contact exists at the base of the limestone? a. conformable depositional c. nonconformity. contact. d. angular unconformity. b. fault (tectonic) contact. e. disconformity. 9. What type of contact exists between the volcanic breccia and the underlying diorite? a. intrusive contact. c. nonconformity. b. conformable depositional d. angular unconformity. contact. e. disconformity. 10. What type of contact exists between the volcanic breccia and the underlying limestone? a. intrusive contact. c. nonconformity. b. conformable depositional d. angular unconformity. contact. e. disconformity. 11. Which rock type is the youngest in the Hutton Gulch region? a. basalt d. volcanic breccia b. diorite e. breccia c. limestone 12. What relationship best allows you to determine the youngest rock in the Hutton Gulch Region? (Hint: How can you determine between the youngest rock and next oldest in the sequence?) a

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