GEOL 1301 - Lab 07 - Geologic Struct & Maps
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University of Texas, Arlington *
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1301
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Geology
Date
Feb 20, 2024
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GEOL 1301 Name: Jonathan Venegas
Geologic structures and maps.
a
Learning and Lab objectives: For this lab we will focus on the concepts you
learned in class during our Earthquake topic. We will further explore what different
types of faults look like, and your TA will introduce two different types of folds.
Lab instructions: For Part 1, fill in Table 1
using the paper models available for you
in class. Be sure to answer the questions below Table 1. For Part 2, a geologic map is given to you in Figure 1. Your TA will introduce what a
strike and dip symbol means when it is presented to you on a topographical map,
and how to use this information to infer what folded layers of rock look like under the
earth. To do this, you will create something called a geologic cross section in the
space below Figure 1.
Supplies needed for this lab: Ruler, colored pencils, protractor, piece of white
paper, pencil and eraser
To successfully complete the lab, please review the following concepts and terms
that you learned in class:
Strike and dip
Normal fault, reverse fault, strike-slip fault
Hanging wall, footwall
In addition, please use your textbook or the links below to review the following
concepts prior to lab:
Anticline and syncline
Geologic map
Geologic profile
Helpful Websites:
http://en.wikipedia.org/wiki/Strike_and_dip
https://opentextbc.ca/geology/chapter/12-4-measuring-geological-structures/
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Part 1: Geologic Structures
There are several models of geologic structures displayed in the lab, numbered from
1 to 5. Fill in Table 1 on the next page with the name of the structure and then
describe the type of movement (e.g., compression, extension, etc.) and how did
each block move relative to each other.
Table 1.
Model
Number
Structure
What happened?
1
Normal Fault The hanging wall is downwards, and they are expanding diagonally in an opposite direction
2
Syncline
The sides have a layering where the upper compound is younger than the ones below
3
Strike-slip fault
The fault is shifting vertically from each other horizontally.
4
Reverse fault
The hanging wall expanded the hanging wall upward, they are expanding diagonally opposite.
Now look at model 5. a) What is the strike and approximate dip of the rock layers? The strike of the rock layers is North, the dip is 60 degrees.
b) Draw the map symbol that you would use to show strike and dip for these layers.
Part 2: Geologic Maps
Geologic maps are similar to topographic maps; however, they add information
about the rocks exposed at the surface and about their underground structure.
Figure 1 is just such a map, and shows the topographical data as black lines, and
the different layers of a folded rock sequence as colors. Your task is to construct an approximate geologic cross-section along the line
that begins at Williamsville and ends at A’. Your lab instructor will explain how to
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proceed. The topography is already marked on the profile in Figure 2, so that part is
done for you! Transfer the information about contacts between different layers of
sedimentary rocks (i.e., where one color changes into another) and the dip of the
layers onto this profile shown by the strike and dip symbols. Then lightly color each
layer in and answer the question below Figure 1.
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the
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The name of the structure we reconstructed is Anticline
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