(Solved): DYNAMIC EARTH LABORATORY LAB PRACTICAL \#2 (Take-Home Exam) Geologic Maps, Geologic Structures, Cro ...

DYNAMIC EARTH LABORATORY LAB PRACTICAL \#2 (Take-Home Exam) Geologic Maps, Geologic Structures, Cross Sections Instructions: This Toke Home Exom is due of $2:15$ pm one week from the last fob doy. - You may use your lecture notes, homework arsignments, lab exercises, reference handouts, lob monual, rextbook, internet, etc. - Any questions about the exam should be directed towands Bill do nof ask the tutars. This is for your own benefit so oll informotion is distributed evenly between students - All answers are to be legible and in your own words. You may nat work with others on this assignment. Any popers with signs of ploglarism from any source will be deolt with very harshly. - You must write your answers an this form. - You will need: Colored Pencils, Protractor, Ruler, Serateh Peper (for crass sectiens). You moy borrow a protractor and colored pencils from EBS 125, but please do not remove them from the lab room and return them to where you found them. 1. Assuming north to be "up" on this paper. plot the following atsitudes on the ".s below. Actitude: East-west strike, dip of $35^{\mathrm{n}}$ to the south Attitude: NE-SW strike, $60^{?}$ : 5 dip Atritude: N120E, B5NE (Use a protractor for the strike.) 2. Draw the map symbols for the following structures: f. Non plunging SW trending syncline axis g. NE Plunging anticline axis 3. Complete the geologic block diagram on the next page and answer the questions that go with it. Complete both the front and the side faces. Draw the bottom of the layer below layer D so that the layer below $D$ is roughly twice as thick as layer $D$. Pnysical Geology Lab-Exam *2 p. 1 b. Is this structure plunging or non-plunging? If it is plunging, give the direction of plunge. c. Give each unit a letter so that the units are in alphabetical order from oldest to youngest (and remember that one unit is already lettered). 4. a. Here are some questions about how you would distinguish between a high angle (steeply dipping) and a low angle (shallowly dipping) fauit using aerial photos: - Which type would have the straighter trace over irregular topography? - Which one's trace would "V" more once it was eroded by streams? 4. b. A dike cuts across ridges and valleys but in map view appears to be aligned perfectly straight, In other words, the trace of the dike is not deflected upstream or downstream by the valleys at all. What is the dip of the dike? Questions 6 and 7: Refer to the geologic maps below. Three formations hove been mapped in these two areas. Formation 1 is the oldest and formation 3 is the youngest. The attitude of the bedrock units is indicated with conventional strike and dip symbols. The dip directions of the foults are given by the arrow on the fault. Assume dip slip (not strike slip) offset on the faults, 5. Map A, a. Label the hanging wall (HW) and footwall (FW). b. What is the attitude of the bedrock formations? c. What type of fault is depicted? d. Indicate the sense of fault movement by adding appropriate symbots on both sides of the fault trace. e. Write a "U" and a "D" (for up and down) on the appropriate side of the fault. 6. Map $B$ (extra credit). a. Label the hanging wall (HW) and footwall (FW). b. What is the attitude of the bedrock formations? c. What type of fault is depicted? d. Indicate the sense of fault movement by adding appropriate symbols on both sides of the fault trace. 7. Complete the Geologic Map below. Use colored pencils to lightly color the different units. Be sure to label and color the explanation as well. Then complete the geologic cross section, label and color all the units. On the cross section show the sense of slip on the fault. Note that there are no hills-the land surface is flat (Kansas). b. What kind of fault is shown in your cross section? c. Which is older, the fold or the fault? d. What is the contact between $T$ and the underlying units called?