1. Enjoy this video: https://youtu.be/gj_dtyX1Lp8. What surface process created
ID: 110346 • Letter: 1
Question
1. Enjoy this video: https://youtu.be/gj_dtyX1Lp8.
What surface process created Chimney Rock, a neat and memorable landform in western Nebraska?
Select one:
a. millions of sedimentary layers that accumulated over time
b. abrasion by wind shaped the sedimentary rocks into the unique landform
2. This question is review of the geologic principles that you learned earlier in the course! You may look them up again in your textbook. Now, use your critical scientist thinking caps... :)
The rocks at Bryce Canyon (the Claron Formation) lie at the very top of the Grand Staircase. They are thus at the highest elevation, above all the other sedimentary layers. The stratigraphic position (place within the entire stack) of these rocks indicates which of the following, when compared to the other layers lower down in the stack?
Select one:
a. The sediments deposited in the Claron are the youngest in the sequence
b. The sediments deposited in the Claron are the youngest preserved on the Grand Staircase (i.e. younger ones may have been washed away)
c. The sediments record the disappearance of the Interior Seaway
3. Based on the videos, you've learned a great deal about the rocks that make up the Great Staircase. Now, use your logic and experience on sedimentary environments to choose the best (i.e. most definitive) evidence for an inland seaway over western North America in the past:
a. volcanic rock that eroded from the Rockies into the basin
b. sand and gravels left behind by streams
c. turtle shells, ammonoids, squids, seashells, and fossilized bones in the sedimentary rocks
4. What was the cause of the inland flooding that lead to a shallow seaway over western North America during this time period?
Select one:
a. The global climate was warm. As glaciers melted, global sea level rose higher and flooded western North America.
b. Wouldn't this precipitation just flow out to sea? Why did it flood much of western North America?
c. The ancestral Sierra Nevada mountains blocked rain clouds from reaching the inland seaway and flooding western North America.
5. The Pink Cliffs at Bryce Canyon (the Claron Formation) lie at the top of the Grand Staircase. Evidence for a shallow lake at this location ~50 million years ago includes one of the items on this list below. Please select the observation documented at Bryce Canyon.
(One great source for reading all about it: here: https://en.wikipedia.org/wiki/Geology_of_the_Bryce_Canyon_area#Claron_flood_plain_and_lake_system)
Select one:
a. A glacial moraine dammed river flow and created a lake
b. limestone rich mud containing freshwater fossils
c. Salt flats show where a shallow marine lake once evaporated
Explanation / Answer
1. What surface process created Chimney Rock, a neat and memorable landform in western Nebraska?
Answer: b. abrasion by wind shaped the sedimentary rocks into the unique landform
2. This question is review of the geologic principles that you learned earlier in the course! You may look them up again in your textbook. Now, use your critical scientist thinking caps... :)The rocks at Bryce Canyon (the Claron Formation) lie at the very top of the Grand Staircase. They are thus at the highest elevation, above all the other sedimentary layers. The stratigraphic position (place within the entire stack) of these rocks indicates which of the following, when compared to the other layers lower down in the stack?
Answer :b. The sediments deposited in the Claron are the youngest preserved on the Grand Staircase (i.e. younger ones may have been washed away)
3. Based on the videos, you've learned a great deal about the rocks that make up the Great Staircase. Now, use your logic and experience on sedimentary environments to choose the best (i.e. most definitive) evidence for an inland seaway over western North America in the past:
Answer: c. turtle shells, ammonoids, squids, seashells, and fossilized bones in the sedimentary rocks
4. What was the cause of the inland flooding that lead to a shallow seaway over western North America during this time period?
Answer: c. The ancestral Sierra Nevada mountains blocked rain clouds from reaching the inland seaway and flooding western North America.
5. The Pink Cliffs at Bryce Canyon (the Claron Formation) lie at the top of the Grand Staircase. Evidence for a shallow lake at this location ~50 million years ago includes one of the items on this list below. Please select the observation documented at Bryce Canyon.
Answer: b. limestone rich mud containing freshwater fossils
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