rock strata these are rock layers under the surface. they are normally flat (horizontal) when...
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![Page 1: Rock Strata These are rock layers under the surface. They are normally flat (horizontal) when deposited. Fold Fault Stratigrapher Geologist](https://reader030.vdocument.in/reader030/viewer/2022013004/56649ea95503460f94bacbf9/html5/thumbnails/1.jpg)
FOLDS & FAULTS
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Words to know Rock Strata
These are rock layers under the surface. They are normally flat (horizontal) when
deposited. Fold Fault Stratigrapher
Geologist that studies rock layers. Rebound theory
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Normal Strata
Flat - aka Horizontal
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Irregular strata
Sometimes rock strata is squeezed and “folded”
A fold is when the strata is bent.
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Folded Strata How does flat strata become folded?
Compressional forces bend the strata. Like paper would respond if you push the sides
together
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Large scale folding
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Faulted Strata
What causes strata to fault or break? Fault is when the strata breaks from
outside forces.
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Rebounding theory Think of a rubber band. If I hold it out it will be flat. But if I add weight it will dip down But when I take the weight off it goes
back.
The Earth does the same!
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Measuring Folds & Faults
Strike The strike is a line
the shows the directions on the surface of the fault.
Dip The angle the plane
goes into the ground.
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Types of faults
1.)Normal 2.)Reverse (thrust)3.)Strike Slip
Faults are caused from forces within the Earth pushing or pulling rock strata.
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How to ID Faults
Head Wall Foot Wall
Normal Fault Head wall moves down
Reverse Fault Head wall moves up
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Strike Slip