Investigation 1 Earth is Rock Part 3 Correlating

Investigation 1 – Earth is Rock Part 3: Correlating Grand Canyon Rocks

Focus Question • How are the rocks from the two Grand Canyon sites related to each other?

Rock Column Model • Which rock is at river level at Mile 52? • Which rock is directly above Rock 4?

Organize rock samples in columns • Place the rocks in the appropriate box on your group’s Grand Canyon Rocks sheets. • For example: Place rock 4 in the rectangle labeled “Rock 4—Limestone” • Do this for all rocks

Compare the rocks • Compare the rock layers found at both sites • Look for similarities and differences between the rock layers at both sites • Explain your observations and conclusions

Discuss observations • Each group will report their observations

Rock names • 10 • 9 • 8 • 7 • 6 • 5 • 4 Kaibab Toroweap Coconino Hermit Supai Redwall Muav Limestone Sandstone Shale Sandstone Limestone

Line up the rock layers • On our Grand Canyon Rocks sheets, we have Mile 20 and Mile 52 right next to one another. However, on the river, how far apart are the two sites? • Which site is farther east?

Line up the rock layers cont. a) Use the dashed lines as guides to cut the Grand Canyon Rocks sheet into two parts b) Turn the white paper lengthwise, so that the long side is horizontal. Label the top of the page “Grand Canyon Rocks Lineup” c) Place the two rock walls on the white paper. Leave as much space between the rock walls as you can Because Mile 20 is farther east, place that site to the right and Mile 52 to the left. d) Work with others in your group to decide how best to position the rock walls on the lineup sheet

Discuss rock lineup • http: //www. fossweb. com/delegate/ssi-wdf-ucmweb. Content/Contribution%20 Folders/FOSS/multimedia/Earth_Histor y/grandcanyon_rock_correlation/index. html

Asses your progress • Look at your sheet and double check accuracy

Layers • In what other context have you used the word layer?

Cross-section poster • Look at the Geologic Cross Section of the Grand Canyon poster • Only in places where erosion has “sliced the cake” can we see the layers that exist beneath the surface

Fill in the rock layers