Answers to Chapter 6 End of Chapter Questions
1. Quartz is a common mineral in sandstone.
circumstances, feldspar is common in sandstone, even though it
normally weathers rapidly to clay.
What conditions of climate,
weathering rate, and erosion rate could lead to a feldspar rich
The combination of a) a cold, dry climate (which gives a slow
chemical weathering rate); b) a rapid mechanical weathering rate
and; and c) a rapid erosion rate all combine to give conditions
that would produce feldspar-rich sandstones.
2. Describe with sketches how wet mud compacts before it
becomes a shale
Your sketch should look something like Figure 6.15 on page 149.
3. What do mud cracks tell about the environment of deposition of
a sedimentary rock?
Mud cracks tell you that an originally wet environment was
exposed to air and dried up.
See page 159-160 for details.
4. How does a graded bed form?
Graded beds form as sediment is deposited by a gradually
More details can be found on pages 157-159 of