Go to Virtual dating: http://vcourseware4.calstatela.edu/VirtualDating/ (the URL was updated 3/10/03)

Read the page, then click on "Virtual Dating Isochron," read instructions and answer the questions (a calculator is helpful). Note that moving the slider will change the display. Proceed through the questions. Note that you must answer all of the questions correctly to get to each following page. If you go through the entire exercise you will be awarded a certificate as a virtual geochronologist. Print out the certificate with your name on it. This will be a page (item 6) in your portfolio.

For page 7.
After studying the chapter on Geologic Time, go to the end of chapter questions. Work out the answer to Q (question)2 and put it on a paper (answer only).

On this same page draw a 2-dimensional cross-section for an area in which the following sequence of events occurred (apply the various principles covered in this chapter). The relative time relationship for all events should be clear from your single cross section that shows what the geology looks like at present.
a. Metamorphism took place during the Archean. During later Precambrinan time uplift and erosion reduced the area to a plane.
b. 3 layers of marine sedimentary rock were deposited on the plain during Ordovician through Devonian time..
c. Although sedimentation may have taken place during the Mississippian through Permian there are presently no sedimentary rocks of that age in the area.
d. A vertical dike intruded all rocks that existed here during the Permian.
e. A layer of sandstone was deposited during the Triassic.
e. All of the rocks were tilted 45 degrees during the early Cretaceous. This was followed by erosion to a planar surface.
f. The area dropped below sea level and two layers of Tertiary sedimentary rock were deposited on the erosion surface.
g. Uplift and erosion during the Quaternary resulted in a slightly hilly surface.
h. Following erosion, a vertical dike fed a small volcano.

Take the usual quiz on-line for chapter 8. If you think any of the questions or answers are irrelevant or wrong, post a message on the List Proc. Write your score and when you took the quiz on this same page.