Using the list of occurrences of key conodont species in

the Usolka River section that is provided in your lab manual on page 21 (question 1), plot the ranges of all conodont species on figure 2.3 in your lab manual. Upload figure 2.3 here to show the conodont species ranges that you plotted.

1. Attach File

10 points   QUESTION 2

1. Based on your graph in figure 2.3, which of the conodont species is exposed over the greatest thickness of the sequence?S. bellusS. longissimusS. wabaunsensisS. cristellarisS. barskovi

0.5 points   QUESTION 3

1. Based on your graph in figure 2.3, which of the conodont species clearly crosses the boundary between the Carboniferous and the Permian?S. bellusS. longissimusS. wabaunsensisS. cristellarisS. barskovi

0.5 points   QUESTION 4

1. Based on your graph in figure 2.3, which conodont species is the last one to appear in the stratigraphic section (that is, shows p only near the top of the sequence)?S. bellusS. longissimusS. wabaunsensisS. cristellarisS. barskovi

0.5 points   QUESTION 5

1. Use the average Pb-206/U-238 values that you calculated to approximate the age of each ash bed using figure 2.6. Upload figure 2.6 here showing how you arrived at the approximate ages.
   
   1. Attach File

10 points   QUESTION 6

1. What is the average Pb-206/U-238 value for bentonite “f”?
   0.04740
   0.04745
   0.04750
   0.04755

0.5 points   QUESTION 7

1. What is the average Pb-206/U-238 value for bentonite “g”?
   0.04725
   0.04728
   0.04730
   0.04735

0.5 points   QUESTION 8

1. What is the approximate age of bentonite “f”?
   298.4 million years old
   299.2 million years old
   299.6 million years old
   300.0 million years old

0.5 points   QUESTION 9

1. What is the approximate age of bentonite “g”?
   298.0 million years old
   298.2 million years old
   298.4 million years old
   298.6 million years old

0.5 points   QUESTION 10

1. What is the approximate age of bed 18/4?
   0.5 billion years old
   0.75 billion years old
   1 billion years old
   1.5 billion years old

0.5 points   QUESTION 11

1. Consider whether the radiometric ages make sense with the sequence of layers as depicted in figure 2.3. Which sample seems to have a date that does not make sense relative to its position in the sequence and to the overall ages of the rocks?
   Bentonite “e”
   Bentonite “f”
   Bentonite “g”
   Bentonite “i”
   Bentonite 18/4

0.5 points   QUESTION 12

1. Select the answer choice below that best explains the reasoning for your answer to question 11.
   The sample did not contain enough biotite, muscovite, or hornblende to determine an accurate age.
    Radiometric dating of sedimentary rock particles indicates the age of the igneous or metamorphic rock from which the particle was derived, not the age of the sedimentary deposit to which it now belongs.
   The isotopes used to date the sample did not have a half-life duration that was long enough to determine an accurate sample age.
    The sample was likely mislabeled and was actually derived from a different location where the age made sense stratigraphically.
   

0.5 points   QUESTION 13

1. Use the relationships shown in figure 2.3 along with the conodont and isotopic data provided to calculate the age of the Carboniferous-Permian boundary. What is the absolute age for the boundary between the Carboniferous and Permian Systems?  1 billion years
   300 million years
   299 million years
   297 million years

 

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