Main Types of Geological Folds
Presentation
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Science
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10th - 12th Grade
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Practice Problem
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Medium
Standards-aligned
Todd Rose
Used 16+ times
FREE Resource
7 Slides • 8 Questions
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Main Types of Geological Folds
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What is a fold?
Folds are primarily caused by compressive stress.
Folds form perpendicular to the direction of stress.
Compression can form folds & faults.
3
Multiple Choice
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Main Types of Folds
Anticline and Synclines often form together as part of a series of folds.
For Anticlines, (shaped like A)the oldest rock is in the center.
Where Synclines have the youngest rock in the center of the fold.
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Multiple Choice
Identify this fold as either anticline or syncline.
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Multiple Choice
In a syncline such as this one, the (youngest/oldest) layers are in the middle of the fold.
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Domes and Basins
Dome: circular uplifted anticline exposing older rock.
Basin: single syncline forming a depression with younger layers surrounded by older layers.
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Multiple Choice
This famouns feature in Yosemite NP is an example of a
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Monocline
As the name implies (mono = one) monoclines have just a single fold such as this example named Waterpocket Fold
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Multiple Choice
Monoclines have a single fold, seperating two areas of horizontal layers.
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Geometry of Folds
Hinge: sharpest point of curvature also called "fold axis"
Limbs: each fold has two limbs on both sides of the hinge.
If a hinge is not horizontal it is said to be "plunging"
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Asymmetric & Overturned folds
asymmetric fold is slightly inclined.
overturned folds are inclined by more than 90 degrees
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Multiple Choice
The sharpest part of the anticline fold is called the
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Multiple Choice
This photo shows a fold that (is / is not) plunging.
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Multiple Choice
Based on the axial surface, this fold is said to be ___
Main Types of Geological Folds
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