rock strata these are rock layers under the surface. they are normally flat (horizontal) when...
TRANSCRIPT
FOLDS & FAULTS
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
Normal Strata
Flat - aka Horizontal
Irregular strata
Sometimes rock strata is squeezed and “folded”
A fold is when the strata is bent.
Folded Strata How does flat strata become folded?
Compressional forces bend the strata. Like paper would respond if you push the sides
together
Large scale folding
Faulted Strata
What causes strata to fault or break? Fault is when the strata breaks from
outside forces.
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!
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.
Types of faults
1.)Normal 2.)Reverse (thrust)3.)Strike Slip
Faults are caused from forces within the Earth pushing or pulling rock strata.
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