Lab 14_2D Structural Geology_online (1)

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Johnson County Community College *

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Geology

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Dec 6, 2023

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Lab 14 2D Geologic Structure Models General Geology Name______Kaitlyn Stallbaumer__________________________________________ Directions : 1. You will need your lab manual and the lab handout to complete this lab. 2. Review pages 202-211 of your lab manual. Flag Figure 5.3 on page 204 for reference when asked to draw map symbols. 3. The 2D block diagrams can be found after the instructions and questions (in the back). 4. The north arrow applies to all block diagrams. Block 1 1. Label the portion of the block diagram that shows geologic formations at the earth’s surface as “geologic map.” 2. Label each portion of the block diagram that shows geologic formations along a vertical plane as “geologic cross section.” There are two. You can write the label once and draw arrows to indicate these portions of the block diagram. 3. Are these layers horizontal or dipping? Horizontal___________________________________ 4. Draw the corresponding symbol on the geologic map for Layer A. 5. Are these beds deformed? No, these beds are not deformed. ______________________________________________ 6. Explain your response with specific examples. You can sketch and label your response. The beds in block 1 figure diagram are flat and undisturbed layers without any folding, faulting, or tilting. The layers are horizontal and undeformed. In the cross-section portion of the diagram the layers seem to be horizontal and undeformed. Block 2 7. Are these layers horizontal or dipping? All the layers are horizontal but, layer A is dipping. 8. What is the strike direction for Layer A? Is Horizontal 1

Lab 14 2D Geologic Structure Models General Geology 9. What is the dip direction for Layer A? Dip direction for layer A is down. 10. Draw the correct symbol on the geologic map for Layer A. Block 3 11. Draw the correct symbol on the map for both occurrences of Layer A on the map. 12. Draw the correct symbol to indicate this fold on the map. 13. Are the layers dipping towards OR away from the fold axis? Circle your response. 14. Is the oldest rock in the middle OR on the edges? Circle your response. 15. What kind of fold is this? Anticline______________________________________________ 16. What kind of stress caused it? Compressional Stress_________________________________________ Block 4 17. Draw the correct symbol on the map for both occurrences of Layer S on the map. 18. Draw the correct symbol to indicate this fold on the map. 19. Are the layers dipping towards OR away from the fold axis? Circle your response. 20. Is the oldest rock in the middle OR on the edges? Circle your response. 21. What kind of fold is this? Syncline________________________________________ 22. What kind of stress caused it? Compressional Stress ___________________________________________ Block 3 and Block 4 23. Describe how you determined if the folds in Blocks 3 and 4 are plunging or non-plunging. I determined blocks 3 and 4 to be non-plunging because the fold axis is horizontal and parallel to the Earth’s surface, as well as the layers within the fold are not tilted or inclined significantly. Block 5 24. What direction does the fault strike? Horizontal___________________________________ 2

Lab 14 2D Geologic Structure Models General Geology 25. What direction does the fault dip? The dip goes downward with the footwall. _____________________________________ 26. Label the hanging wall (hw) and footwall (fw). 27. Did the hanging wall move up or down? It moves up ____________________________________ 28. What type of fault is this? Reverse Fault _______________________________________________ 29. What type of stress caused this? Compressional Stress_________________________________________ Block 6 30. What does the symbol for Rock Layer F mean? It means it is a horizontal bed _____________________________ 31. What direction does the fault on the left strike? Vertical__________________________________ 32. What direction does the fault on the left dip? Down_______________________________ 33. What direction does the fault on the right strike? Vertical_______________________________ 34. What direction does the fault on the right dip? Down___________________________ 35. Label the hanging wall block(s) and footwall block(s). 36. Label the horst(s) and graben(s). 37. Did the hanging wall block move up or down? Down_________________________________ 38. What type of fault is this? Normal Fault ________________________________________________ 39. What type of stress caused this? Tensional Stress _____________________________________________ 40. What region of the United States is characterized by these structures? California, Montana, upper north in the United States 3

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