Lecture 11 Assignment (2)
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Arizona State University *
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251
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Geology
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Apr 3, 2024
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Uploaded by ProfessorOysterMaster1078
Lecture 11 Assignment
GEOS251 | Spring24
Name: _______________________________ Grade: ___/10 pts
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This lecture assignment covers key concept presented in lecture 11.
Assignment due on Tuesday 20
th
February at 11am.
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1. According to the diagram above:
o
which sediments can be transported with a flow velocity of 10 cm/s? [1.5 pts]
o
which sediments will be deposited with flow velocity of 1 cm/s? [1.5 pts]
2. Circle the right answer [1 pt]: Larger and more angular sediments indicate transport over a LONGER
or SHORTER
distance than smaller and rounded sediments.
3. Please draw a cross bedding structure and indicate the direction of the current [2 pts]
Lecture 11 Assignment
GEOS251 | Spring24
4. Imagine a turbiditic current transporting coarse
, medium
and fine
-grained sediments. Once all the sediments are deposited, how would it look like? Please draw a schematic sequence of sediment from bottom to top [1.5 pts]
5. Imagine you are having the best time of your life looking at sedimentary rocks in Arizona under 110˚F in July. o
Suddenly, you come across an outcrop where limestone is on top of shale
. How do you interpret it? Circle the right answer [0.5 pt]
A. Transgressive sequence (sea level rise), or
B. Regressive sequence (sea level fall)
o
You keep walking because you love doing geology (I know it!), and….you come across another outcrop where sandstone is on top of shale
. How do you interpret it? Circle the right answer [0.5 pt]
A. Transgressive sequence (sea level rise), or
B. Regressive sequence (sea level fall)
o
Then, after 6h in the field, you finally remember where you put your glass of seawater this morning (best drink ever in the field!). When you find it, all the water is gone by evaporation. What type of sedimentary rocks are formed by this process? [0.5 pt]
________________________
6. During the diagenesis, pressure and temperature increase as sediments get buried deeper.
The physical change is called ___________________ [0.5 pt]
The chemical change is called __________________ [0.5 pt]
Draw inside the box
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