Problem 1
Develop a geological "life history" of a sedimentary rock. Begin with a mass of igneous bedrock in a mountain area and end with your sedimentary rock being collected by a future geology student. Be as complete as possible.
Problem 4
If you hiked to a mountain peak and found limestone at the top, what would that indicate about the likely geologic history of the rock atop the mountain?
Problem 5
Why is it not necessary to indicate the texture of detrital rocks on the identification chart for sedimentary rocks (Figure 7.21\() ?\)
Problem 6
During a hike in Utah's Zion National Park, you pick up a sedimentary rock sample. When you examine the sample with your hand lens, you see that the rock consists mainly of rounded glassy particles that appear to be quartz. To be sure, you make two basic tests. When you check for hardness, the rock easily scratches glass, which is what quartz would do. However, when you place a drop of acid on the sample, it fizzes. Explain how a rock that appears to be rich in quartz could effervesce with acid.
Problem 10
While on a field trip with your geology class, you stop at an outcrop of sandstone. An examination with a hand lens shows that the sandstone is poorly sorted and rich in feldspar and quartz. Your instructor tells you that the sediment was derived from one of two sites in the area: Site \(\\# 1:\) A nearby exposure of weathered basaltic lava flows. Site #2: An outcrop of granite at the previous field trip stop up the road. Select the most likely site and explain your choice. What name is given to this type of sandstone?
