Observe the block diagrams.

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Module 2_ Interactive Lecture _ Schoology.pdf 
Observe the block diagrams.  Place events in order of occurrence in the respective places below.  Work from oldest to youngest, bottom to top.  Be sure to note any folds, faults and unconformities and their types.Next, using the data provided, answer the questions on radioisotope dating and determine the age of the rock indicated.  Save your files and attach it in Schoology.GEO101L_Lab2_Sequence.docx 

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1. Observe this block diagram. Place events in order of occurrence in the respective places below.
Work from oldest to youngest, bottom to top. Be sure to note any unconformities and their types.
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2. Observe the block diagram above. Place events in order of occurrence in the respective places
below. Work from oldest to youngest, bottom to top. Be sure to note any unconformities and their
types.
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ir3. Observe the block diagram above. Place events in order of occurrence in their respective places
below. Work from oldest to youngest, bottom to top. Be sure to note any unconformities and their
types.
28.
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Absolute Dating
In this part of the exercise, you will be calculating the actual, or absolute, ages of the
rock.
The figure above shows the relationship between the percentage of parent material
and the number of half-lives that have passed.
4. What percentage of the parent material is present after one half-life?
Two?
Three?
Four?
5. If you start with 80 grams of an isotope, how much would be left after-one halflife?
What about three half-lives?
6. If an isotope has a half-life of 600 million years, how old is a rock that contains
the isotope after 50% of the parent has decayed?
How old is the rock after four half-lives have passed?
7. You discover the parent isotope in a lava flow has gone through 0.75 half-lifes. If
a half-life is 800 million years, how old is that rock?
8. In number 1, at the beginning of the exercise, Layer F was dated at 260 million
years old. Layer E was determined to be 235 million years old. When did the fold
occur?
9. The image to the left show a
series of sections containing
various fossils. If the star is 325
million years old (ma), and the
heptagon (the 7-sided fossil) is
337 ma, how old is the 15-sided
fossil in between?
If the star existed for three
million years, from 324ma327ma, how old must the arched
arrow in section three be?
10. Based on what you learned about fossil preservation, how might the following
be preserved as fossils?
Dinosaur bones?
Microscopic organisms like bacteria and protists?
Skin or feathers?
DNA?

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