Download Today, you will know one of the FIVE STUPID THINGS WE GOTTA

SUPERPOSITION / RELATIVE DATING IS
EXACT
SUPERPOSITIO
N / RELATIVE
DATING DOES
NOT SAY
EXACTLY HOW
OLD..
RELATIVE
DATING DOES NOT
SAY EXACTLY HOW
OLD..
...IT JUST TELLS
US SOMETHING
PROBABLY
HAPPENED
BEFORE OR
AFTER
SOMETHING
ELSE!
RELATIVE
4
DATING DOESN’T
TELL YOU “HOW
OLD”
...JUST
WHETHER
SOMETHING
CAME BEFORE
SOMETHING
ELSE!
THE LAW OF
SUPERPOSITION IS
EASY.
Newest rock on top
 Oldest on bottom

THE LAW OF
SUPERPOSITION IS
EASY.
Newest rock on top
 Oldest on bottom

But…
THE LAW OF SUPERPOSITION IS EASY,
BUT…

What about this?
CRACKS IN OUR EARTH’S CRUST ARE
CALLED _________.
CRACKS
IN OUR EARTH’S CRUST ARE
CALLED _ _ U _ _ S.
CRACKS IN OUR EARTH’S
CRUST ARE CALLED
FAULTS.
FAULTS CAN TELL US
WHAT DIRECTION
EARTH’S CRUST IS
MOVING!.
“cracks”
FAULTS.
Which type of fault
happens with
transforming plates?
Which type of fault shows
plates diverging?
Which type of fault shows
plates converging?
FAULTS.
Which type of fault
happens with
transforming plates?
Which type of fault shows
plates diverging?
Which type of fault shows
plates converging?
WHICH HAPPENS FIRST :
THE LAYERS OR A FAULT?
WHICH HAPPENS FIRST:
THE LAYERS OR A FAULT?
WHICH HAPPENS FIRST:
THE LAYERS OR A FAULT?
The LAYERS had to be
there BEFORE the FAULT
cracked through.
SO, IS A FAULT
RELATIVELY YOUNGER
OR OLDER THAN THE
LAYERS IT BREAKS
THROUGH?
SO, IS A FAULT
RELATIVELY YOUNGER
OR OLDER THAN THE
LAYERS IT BREAKS
THROUGH?
FAULTS are relatively YOUNGER
than the layers they crack
through.
WAS THEIR
CONVERGING,
DIVERGING OR BOTH?
WHAT IS THIS WIDE WAVY THING??

Is THIS a FAULT???
THICK VEINS OF IGNEOUS OR
METAMORPHIC ROCK CUTTING
UPWARD THRU LAYERS ARE CALLED
INTRUSIONS.
How do you think these intrusions
happened?
WHAT’S RELATIVELY YOUNGER:
THE LAYERS OR AN INTRUSION?
In other words, which
happened first: the layers or
the intrusion?
WHAT’S RELATIVELY YOUNGER:
THE LAYERS OR THE INTRUSIONS?
1
Put 1, 2 and 3 in order from
oldest to youngest.
3
WHAT’S RELATIVELY YOUNGER:
LAYERS OR THE INTRUSION?
Like faults, intrusions are
also _________ than the layers
they crack through.
WHAT’S RELATIVELY YOUNGER:
LAYERS OR THE INTRUSION?
Like faults,
intrusion are
also YOUNGER
than the layers
they crack
through.
BOTH OF THESE GEOLOGICAL
FORMATIONS FOLLOW THE SAME
RULE!
FAULTS
INTRUSIONS
The LAW of
CROSSCUTTING:
LAW OF CROSSCUTTING:
FAULTS
& INTRUSIONS ARE
RELATIVELY YOUNGER THAN
THE SURROUNDING LAYERS OF
ROCK THEY BREAK THROUGH.
LAW OF CROSSCUTTING:
FAULTS & INTRUSIONS ARE
YOUNGER THAN THE
SURROUNDING LAYERS OF ROCK
THEY BREAK THROUGH.
WHY???
LAW OF CROSSCUTTING: FAULTS &
INTRUSIONS ARE YOUNGER THAN
THEIR SURROUNDING LAYERS OF
ROCK.
Why? Because the CRACKED
LAYERS had to ALREADY be
THERE in order for the fault or
intrusion to show up!
LET’S TRY APPLYING THE
LAWS OF
SUPERPOSITION (AND
CROSSCUTTING):
LAW OF SUPERPOSITION WITH
THE LAW OF CROSSCUTTING…
-
MORE SUPERPOSITION!
FAULTING
ORDER FROM YOUNGEST TO OLDEST…
USE THE LAWS OF SUPERPOSITION & CROSSCUTTING TO
RELATIVELY DATE THE LAYERS BELOW FROM OLDEST
TO YOUNGEST.
G
WHICH CAME FIRST: THE INTRUSION OR THE FAULT?
WKSHEET…
THE
LAW OF
SUPERPOSITION IS NOT
ALWAYS EASY…
G
WHICH CAME FIRST: THE INTRUSION OR THE FAULT?