It's All Relative
Homework 1_Age & Times of Mars vs. Earth
Julia Kahmann-Robinson PhD and Marjorie Chan PhD, University of Utah Department of Geology & Geophysics
Apply relative dating laws, interpret block diagrams, Earth road cuts, and Mars imagery in with relative dating techniques.
Observe Figure 1 and answer the following:
- How many unconformities are there? Name each kind and why you named it such.
- What law did you use to determine the relative ages of the Ten Mile Sandstone and Appian Sandstone?
- List the order of geologic events by name from oldest to youngest below (i.e. Surface A, Rhyolite Dike C, Ten Mile Sandstone etc.):
Road Cuts on Earth
Navigate to the website: http://www.gigapan.com/gigapans/104247 to view the Moab Fault Zone in Utah.
- How many faults can you observe?
- How many geologic units would you break out? What criteria are you using to differentiate your geologic units?
- What principle of relative dating is most useful when you are interpreting this image?
- Are there any unconformities? If so, how many and what are they?
Tractus Catena on the south of Alba Mons
Figure 2 is an image taken by THEMIS of a fracture zone on Mars. Observe the image and answer the following questions:
- Order the geologic events from oldest to youngest. Make sure you note the entire image as you make your decisions.
- What makes this image difficult to interpret?
- What law(s)/principles of relative dating are you using to interpret the image?
- Since you are already familiar with tectonics, what created features B. and D.