## Earth Science: Average Rate of Sediment Deposition

1. The problem statement, all variables and given/known data

Link of picture that the information below is referring to: http://i56.tinypic.com/283lv.jpg
You encounter the sedimentary rock outcrop shown above while you are out hiking. You collect rock samples from points A-D and go back and measure their ages in your isotope lab.
A=10.1251 million years old
B=10.1259 million years old
C=10.1262 million years old
D=10.1278 million years old
From detailed analyses of the rock textures and minerals found in the rocks, you determine that all of the rocks were formed from sediments deposited in a floodplain environment.

A) Calculate the average rate of sediment deposition for the unit sampled by rocks A and B (show your work and give units):

B) What is the average rate of sediment deposition for the unit sampled by rocks C and D (show your wok and give units):

C) What changes in the local environment do you think might have caused this change in deposition rate?

2. Relevant equations
None that I know of.

3. The attempt at a solution
I don't know how to approach this problem at all.

Thanks

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 Admin How is rate of sediment deposition defined?
 I'm not sure... that's all the information that's given.

## Earth Science: Average Rate of Sediment Deposition

It should be defined in your books, or in your notes. If it is not - think, what IS rate of sediment deposition?

 A) Rock B-Rock A = # Take that #and 1.8/# Answer: .00225 B) Rock D-Rock C = # Take that #and 2/# Answer: .00125 That's what I think it is.