Geologic Time HW2

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Mesa Community College *

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101

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Geology

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Dec 6, 2023

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docx

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Geologic Time Homework 1 . You have become so interested in geology that you get a part time job calculating ages of igneous rocks. Your first sample when analyzed gives the results listed below.(4 pts) # of parent isotopes # of daughter product 625 9375 The isotope system you are using has a half life of 300 million years. How old is the rock sample? (Show your work) 625/10000*100= 6.25 9375/10000*100=93.75 Parent iisotop-= 6.25 6.25=100/2^n=16 2^n=2^4 N=4 4*300 million years= 1200 million years. 2. Put the sequence in order from oldest to youngest including the fault . Layer K & H are igneous rocks. (9 pts) (Do not include X, Y or Z).

1. G 2. B 3.D 4.K 5.E 6.H 7.L 8.P 9.J 10.A 11.C 12. Fault M 13. F 3. If layer K has been dated at 300 Ma, what is the age of layer E relative to layer K?(2 pts) If layer K been dated at 300 million years than the age of layer E will be less than 300 million years. Layer E will be younger than K. 4. In general what does an unconformity represent?(2 pts) An unconformity represents during time which no sediments were preserved in a region the next deposition. 5. Name each of the following unconformities on the diagram?(3 pts) Nonconformity Disconformity Angular Unconformity X angular unconformity Y nonconformity Z disconformity

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Geologic Time HW2

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