![]() In what Geologic Era did intrusion of the diorite occur? a. In what Geologic Era did volcanism first occur in this region? a. How many periods of uplift and erosion are represented in this cross-section? Do NOT include eroison of the current surface of the Earth. ![]() What relationship best allows you to determine the age relationships between folding and faulting in this region? a. In what Geologic Era did folding occur in this region? a. In what Geologic Era did fauting occur in this region? a. Volcanic eruption forming emplacement of the basalt flows on Earth's volcanic breccia. Which of these geologic events are most recent? a. law of original continuity e principle of inclusion claw of original horizontality 13. 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. Which rock type is the youngest in the Hutton Gulch region? a. What type of contact exists between the volcanic breccia and the underlying limestone a intrusive contact nonconformity. What type of contact exists between the volcanic breccia and the underlying diorite? a intrusive contact c nonconformity. What type of contact exists at the base of the limestone? a. What type of contact exists at the base of the cross-bedded sandstone? a. law of original continuity e faunal succession c. 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. fault (tectonie) contact e disconformity c nonconformity 6. The contact between the gneiss and the overlying fractured sandstone represents what type of contact? a. ![]() law of original continuity e faunal succession claw of original horizontality S. 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 original continuity e principle of inclusion c.taw of original horizontality 4. What principle allows you to best distinguish the age relationship between the gneiss and the diorite? a. Which rock unit is the oldest in this cross-section? a. The contact between the granite and the gneiss represents what type of contact? a. Questions in this section: Mark the best answer to questions on the geologic history and contact relationships of the Hutton Guich area. Rock Age (Ma) Basalt flow 343 Volcanic Breccia 354 Diorite 70.2 Granite 220,0 Gneiss $15.0 *Age in Me, millions of years. Note: Radiometrie ages have been determined for a number of igneous and metamorphic rock units in this area. Rock unit symbols are shown in key, but are not arranged in order of age. E Sedimentary Rock Units Igneous Vakanced Metamorphic Figure CQ.CH1 Geologic cross-section of a hypothetical area Hutton Gulch. Cross Section of Hutton Gulch Steno's fault W Breccia composed of basalt clasts.
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