Map  Exercises

Part 1)

Examine the topographic map below and answer all the questions.  Type your answers in a Word document or Excel spreadsheet and email the answers to me. 

1.  Which township, range and section is the quarry just north of the Alaska Highway located in ?

2.  Which township, range and section is the sawmill just east of the Gerstle River located in ?

3.  What are the approximate UTM coordinates for the benchmark “BM Gerstle” located on the west end of the Gerstle River bridge ?

4.  What are the approximate UTM coordinates for the sawmill described in question 2 ?

5.  Approximately how many miles separate the Gerstle River (on the west side of the map) and the Tanana River (to the east) ?

6.  What is the approximate azimuth or bearing of the Alaska Highway in the map area ?

Part 2

Study the example below of the field geologic map (Map 1) and the derivative interpretive geologic map (Map 2).  Notice how contacts between the limestone and shale were inferred.  Likewise, the contact was drawn between the shale and the sandstone, and between the sandstone and the schist.  Notice how a line was drawn between the large area of conglomerate to the south, and the rest of the lithologies to the north. 

1.  Notice how the limestone outcrops in the northwest portion of Map 2 dip towards each other. 

     What type of fold structure does this imply in this area?

2.  Notice how the conglomerate formation dominates the south portion of the map.  The contact of the conglomerate cuts across the bedding of the schist-sandstone-shale-limestone sequence.  Is the conglomerate older or younger than the schist-sandstone-shale-limestone sequence ?

3.  Make an interpretive geologic map (Map 4) from the field geologic map (Map 3). 

4.  Draw the approximate trace of a fault, with a heavy dash line, based on the presence of breccia.

5.  Which direction do the rocks in the northwest portion of the map dip ?

6.  Is the granite older or younger than the fault ?