GEOL 1105 Rock Formation

GEOL 1105 Rock Formation

Instructions/Descriptions

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GEOL 1105 Rock Formation

Web Extras for Chapter 13: Geologic Time

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Complete exercise 1 on page 235, 236. Fill out the column on the right side of Figure 13.8 and Figure 13.9, show your work. When completing the order of events for Figure 13.9 include folding, erosion and erosion between the correct layers of rock.

Relative Dating of Events in the Grand Canyon. Go to www.kaibab.org/geology/gc_layer.htm and scroll down to the schematic geological section at the bottom of the page. Concentrate on the Precambrian part of the section, that is, everything below the Tap eats Sandstone, and answer the following:

Is the Zoroaster Granite older or younger than the Vishnu Schist?

The Bass Limestone?

What is the oldest sedimentary rock?

What name is applied to the surface separating the Vishnu Schist and the Bass Limestone (be specific)?

What surface separates the Bass Limestone and the Tap eats Sandstone?

Major Events in the History of Life. The Museum of Paleontology at the University of California, Berkeley, has an excellent website that summarizes many important events in the history of life. Visit www.ucmp.berkeley.edu/index.php and under Online resources click on Tour of geologic time (www.ucmp.berkeley.edu/help/timeform.php). Click on Archean, Proterozoic, Paleozoic, Mesozoic, and Cenozoic to determine when the events in the list below occurred. For the Paleozoic, Mesozoic, and Cenozoic you may have to go back and click on the finer subdivisions (e.g., Triassic period). Write the answers below and, to get an overall sense of history. Fill out the right-hand column of the Geologic Time Scale (Fig. 13.7) and show your work.

Oldest known fossils?

Transition to atmosphere with oxygen?

First animals?

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Knowing that the oldest Precambrian sedimentary rock in the Grand Canyon is about 1,250 may. (Million years) old and the youngest about 825 may., use maximum thicknesses given for the Precambrian sedimentary rocks (that is, exclude the Cardenas Lavas) and calculate the “average” rate of accumulation in feet/may.

How significant is this number? In other words, is each of the sedimentary formations deposited in different depositional environments likely to accumulate at the same rate? Why or why not?

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What biological event began the Paleozoic?

What biological event ended the Paleozoic?

First plants to colonize the land?

First forests?

First tetrapod’s (four-legged vertebrates) to move on land?

First dinosaurs?

Start of breakup of Pangaea?

Early Mammals?

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First flowering plants?

Extinction of the dinosaurs?

What is the Age of Mammals?

What else could the Cenozoic be called?

GEOL 1105 Rock Formation

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