105L Lab 9 - Geologic Structures
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Orange Coast College *
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A110
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Geology
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Jan 9, 2024
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105 Lab – Geologic Structures
Name: ________________________________________
Complete the blank sides of the following block diagrams, identify the structure, and add any symbols.
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Examine the geologic block models below. For each, identify the type of structure shown, then draw any
appropriate symbols (including, but not limited to, strike/dip, fold axis, fault motion) on the top surface
of the model. Refer to your lab manual handout or the pre-lab reading as needed. Each block is labeled
with a distance scale (in meters) and a north arrow.
1.
Identify the structure:
What type of stress (circle one):
Compression
Tension
Shear
2.
Structure:
_____________________________
Draw appropriate strike and dip symbols
on the ground surface.
In which direction are the layers tilted?
3.
Identify the structure:
What type of stress:
Compression
Tension
Shear
Draw appropriate strike
and dip symbols to indicate
the change in layer
attitudes.
Draw and label the fold axis on the ground surface.
Is this fold upright or plunging?
4.
Identify the structure:
What type of stress:
Compression
Tension
Shear
Draw appropriate strike and dip
symbols to indicate the change in layer
attitudes.
Draw and label the fold axis on the ground surface. Is this fold upright or plunging?
5.
Identify the structure:
What type of stress:
Compression
Tension
Shear
6.
Identify the structure:
What type of stress:
Compression
Tension
Shear
Draw appropriate strike and dip symbols to
indicate the change in layer attitudes.
Draw and label the fold axis on the ground surface.
Is this fold upright or plunging?
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7.
Identify the structure:
What type of stress:
Compression
Tension
Shear
Use appropriate symbols to label the
structure on the ground surface.
Draw strike and dip symbols on the ground surface to indicate the attitude of the rock layers.
8. This model includes surface topography.
Identify the structure:
Draw appropriate strike and dip symbols
to show the attitude of the rock layers on
the ground surface.
9. This model includes surface
topography.
Identify the structure:
Explain the pattern of bedrock
layers seen on the ground surface.
Are they due to the attitude
(strike/dip) of the layers? If not,
what causes the pattern we see?