GEOL 1301 - Lab 06 - Geologic Struct & Maps
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University of Texas, Arlington *
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1301
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Geology
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Feb 20, 2024
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GEOL 1301
Lab 06
Geologic Structures and Maps
In this lab, you will learn about geologic structures and how to read and work with a geologic
map. Please complete the attached worksheets and submit them to your instructor. Don’t forget to put your name on the worksheets!
Supplies needed for this lab:
Ruler, colored pencils, protractor, piece of white paper, pencil and eraser
Important notice:
In order to successfully complete the lab, please review the following concepts and terms in your textbook and on the websites listed below.
Terms and Concepts:
Strike and dip
Normal fault, reverse fault, strike-slip fault
Hanging wall, footwall
Anticline and syncline
Geologic map
Geologic profile
Helpful Websites:
http://en.wikipedia.org/wiki/Strike_and_dip
http://commons.wvc.edu/rdawes/basics/structures.html
1
Geologic Structures
There are several models of geologic structures displayed in the lab, numbered from 1 to 4.
Name the structure and describe what happened in each case (e.g. compression or extension, how did the rocks move relative to each other, etc.
Model
Number
Structure
What happened?
1
Reverse fault
The hanging wall has moved up while the
footwall has moved down along the fault
2
Anticline and syncline
Forms in sections of the crust that are
undergoing compression. Crustal
compression is response to stress from
more than one direction which causes
tilting and folding. Anticline appears as a
parallel of the same rock that dip away
from each other, syncline dip towards
each other.
3
Strike slip
Steep or vertical faults along which the
rocks on either side have moved
horizontally in opposite directions.
4
Normal fault
The hanging wall has slid down while the
footwall has slid up along the fault
Now look at model 5. a) What is the strike and approximate dip of the rock layers? b) Draw the map symbol that you would use to show strike and dip for these layers.
2
Geologic Maps
Last week’s lab was about topographic maps. Geologic maps add information about the rocks exposed at the surface and about their underground structure to a topographic map. Use the geologic map provided in the lab to answer the following questions:
What is the name of the map?
Geologic Map of the Williams Quadrangle, VA
What is the ratio scale of the map?
1:62500
What is the contour interval of the map?
40 Feet
What are the latitude and longitude at the northeast corner of the map?
79
°30’
38
°15’
What do the different colors used on the map stand for?
They stand for sections in the 3 different periods of history.
Each color is represented with a sequence of letters. What does the first (capital) letter stand for?
It stands for the period of time-
What is the age range of the rocks depicted in this geologic map?
488.3 to 358.9 million years ago
3
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Geologic Profile
Find the line A to A’ on the map. Construct an approximate geologic cross section from Williamsville (contact between Dri and Dm) to A’. Your lab instructor will explain how to proceed. The topography is already marked on the profile below. Transfer the information about geologic contacts and the dip of the layers onto this profile, color and mark the layers.
What is the geologic structure that you reconstructed?
4