Teacher's Answer Key

1.  Can the town of In Gall be reached by truck?  Do you need to pass through any other towns?
Yes, Agadez

2.  What is the area around In Gall like?  Where is the rock covered by sand or trees?  (HINT:  Describe your answer using the compass directions by saying “North of In Gall there are…”.  See the compass below the maps.)
A sand dune covers the ground north, west and south of In Gall. A road enters In Gall from the northeast

3.  Determine the ages and types of the rocks by locating the rock age symbols (T, C, J, etc.) and the rock type symbols (t, m, v) in the map key.

Do you think it is possible to find dinosaurs of Triassic age in this area?
NO
Why or why not?
There are Triassic rocks in te map area, but these are marine, there are no terrestrial Triassic Rocks.

4.  You need to know where to search for Cretaceous dinosaurs.  Are there rocks of Cretaceous age?
Yes

If so, are any of these Cretaceous rocks terrestrial (formed on land)?
Yes

Color in this rock area on the geologic map with your pencil.

5.If terrestrial Cretaceous rocks exist in the map area, are any exposed at the surface?  (HINT:  Look at the geographic map for areas no covered by dunes)
Yes

5.  If you were camping in In Gall, where would you take your team to search for new Cretaceous dinosaurs?  (HINT:  You must give a direction from In Gall, using the compass, and a distance from In Gall, using the distance scale under the map)
I would lead the team due south about 100 miles, because this would put us in the area of terrestrial Cretacious rocks that are not covered by sand dunes.

 


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