ESS241
Lab 4: Geological cross-section
Due date: Oct. 14th, 2024, 11:00 pm for Monday Lab session Oct. 17th, 2024 11:00 pm for Thursday Lab session
Total: 50 points
For this lab you will need
Graph paper
Mechanical Pencil or regular pencil with a sharpened point for neatness
Color pencils
Ruler
Protractor
Eraser
The artificial geological map on the last page shows several sedimentary layers. Using structure contours (strike lines) construct a geological profile along the line Y-Z. Do not exaggerate the profile (No vertical exaggeration). Determine thickness and orientation (dip direction and dip) of the individual layers. It is recommended that you draw your cross-section on Graph paper.
Marking scheme
a. Strike lines on map- 5 point
b. Topography on the cross-section (solid line for known, dashed for unknown)- 5 points
c. Lithologies on the cross-section- 5 points
d. Orientation of the lithologies (show your calculations)- 5 points
e. Does the cross-section show the true dip or apparent dip of the lithologies? How do you know this? - 3 points
f. True thickness of the lithologies B, C, D, E (show your calculations)- 5 points
g. Title and north arrow- 1 point h. Scale - 2 points
i. Label Axes- 2 point
j. Label outlier and inlier (on map and cross-section)- 4 points
k. Imagine there is a deposition of new sediments in the eastern valley of your cross-section. What type of unconformity would you have here? - 2 points
l. At what angle, to your original cross-section would you have to draw a second cross- section to see the dips of the lithologies at 10o ? (Show your calculations)- 6 points
m. Neatness (Legible handwriting, crisp lines, clean cross-section)- 5 points Length