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beach gravel deposits
Consider the following questions and answer them in your write up for this lab. You will need to use the maps AND the documentation to answer some of these questions (starting with question 3). You may use additional resources as necessary (e.g., for number 13 it might be helpful to google E-W trending mountain ranges).
Locate a geologic time scale and insert it into your lab report with a brief description. In terms of relative time, put these following geologic timeframes in order and indicate an approximate age for each (note: Some of these will overlap based on how they are classified): Holocene, Mississippian, Tertiary, Paleozoic, Pleistocene, Pennsylvanian, Mesozoic, Devonian, Triassic, Cambrian, Jurassic, Cretaceous
Where in your timeline is the K-T (or K-Pg) boundary? What happened here? (search the web if necessary).
Examine the overall map, characterize the large-scale patterns. East/West? North/South.
For example, what trends do you see in the ‘relief’ of the map as you move across the country?
In general, where are the oldest rocks found?
Using the pamphlet, read the information on pages 5-15. On your outline map, identify areas described by numbers 7, 9, 12, 13, 16, 19, 22, 34, 35, 41, and 46?
How are folded ranges created?
Locate the Michigan Basin and the Nashville Dome, do the ages of the rocks have the same pattern in each feature (older-younger or younger to older?)
What is the geologic origin of Florida?
Explain how beach gravel deposits can be found in Lauderdale, Colbert, and Franklin County, Alabama.
From what period do the granite core of the black hills originate? How old are these rocks?
What are the “staked plains” and how did they get their name?
What is the cause of the “Basin and Range” province?
Most of the Mountain ranges trend N-S. Identify on your map the mountain ranges that trend E-W.
The Mississippi embayment is an area of flat land and very young sediments that show where the Gulf of Mexico filled in much of the lower Mississippi valley. On your map sketch and label the Mississippi embayment.
Crowley’s Ridge appears right through the heart of the Mississippi Embayment, label this feature and suggest how it might have been formed?
Glaciers covered much of North America as recently as 11,000 years ago. Can you identify landforms that are associated with the presence or melting of glacial ice? Identify on your map the extent of the most recent continental glaciation.
Locate the coastal barrier islands, what is the difference between east and west coasts? (Mexico is not an ocean!)
Sutter Buttes is plainly visible as a small but obvious ‘bump’ in the central valley of California. What sort of event would produce an isolated and singular ‘bump’ like this?
Attach your completed map to your write up and make sure you have labeled features on the map that help answer the questions.