Earth Science Grade 8 The Principle of Superposition the rocks on the bottom of the column are older than the rocks at the top The Principle of Original Horizontality most sedimentary layers of rock are deposited in a ID: 446335
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Slide1
Relative Dating
Earth Science
Grade 8Slide2
The Principle of Superposition
: the rocks on the bottom of the column are
older than the rocks at the top. The Principle of Original Horizontality: most sedimentary layers of rock are deposited in a horizontal (flat) position.
Youngest Rocks
Oldest RocksSlide3
The Principle of Cross Cutting Relationships:
Sometimes magma pushes, or intrudes, into cracks in existing rocks. When the melted rock cools and solidifies, the resulting feature is called an
igneous intrusion.Slide4
Plate boundaries:
Motion along
faults causes rock layers to be offset from each other. This can cause the flat layers of rock to shift off kilter or cause “bending” of the rock.
Compression or mountain building
Convergent boundary
Strike/Slip Transform Plate BoundarySlide5
Unconformities:
Sometimes, an area where layers of sediments have been deposited is
uplifted, and the surface experiences erosion. If more layers of sediments are subsequently added on top of this erosion surface, the resulting feature is called an unconformity. Slide6
Notice how the layers are labeled oldest (A) to youngest (E)Slide7
See if you can identify which layers are the oldest to youngest:
A
B
C
D
E
F
Oldest
YoungestSlide8
See if you can identify which layers are the oldest to youngest:
A
B
C
D
E
F
Oldest
Youngest
E
->
C
->
B
->
A
->
D
->
FSlide9Slide10
A
B
DE
CADC
BESlide11Slide12
B
A
CSlide13Slide14
E
I
DH
BFACGSlide15Slide16
E
B
IF
GCAHD