Fossils can tell us about our biological life past Wed have to build stronger refrigerators FOSSILS can tell us about our B IOLOGICAL PAST How can fossils help tell us Earths GEOLOGIC ID: 576333
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Slide1Slide2
Fossils can tell us about our biological (life) past…Slide3
Fossils can tell us about our biological (life) past…Slide4
We’d have to build stronger refrigerators.
FOSSILS can tell us about our
B
IOLOGICAL PAST.Slide5
How can FOSSILS help tell us Earth’s
GEOLOGIC
history?Slide6
How can FOSSILS help tell us Earth’s
GEOLOGIC
history?
W
hen they are INDEX FOSSILS!!!Slide7
INDEX fossils can be any type of fossil, BUT these help us DATE the ROCK LAYERS…
SPECIAL!!Slide8
REMEMBER HOW WEGENER LINED UP FOSSILS FROM ACROSS CONTINENTS TO SHOW HOW THE PLATES WERE CONNECTED?Slide9
Some fossils help us line up layers of rock from 2 different continents
. Slide10
Some fossils help us line up layers of rock from 2 different continents. Slide11
We call these
INDEX FOSSILS!Slide12
Like a BOOK’s INDEX helps you find things inside a big book!Slide13
GOOD
INDEX fossils
need to beSlide14
GOOD
INDEX fossils
need to be1. …
on
more than one continentSlide15
GOOD
INDEX fossils
need to be1. …
on
more than one continent
2.
but
only
in
1
layer
Slide16
GOOD
INDEX fossils
need to …
cover
more than 1 continent
on Earth but are only in
1
layer
so we can compare and line up rock layers around the world. Slide17
INDEX fossils
are great!
They around many places but only briefly in 1 layer so we can compare and line up rock layers around the world
. Slide18
Which fossil is only
found
in a single
layer over time & place?Slide19
Which fossil(s) would make the best index fossils?Slide20
Why isn’t the fossil in layer “b” a good index fossil? Slide21
Why isn’t the fossil in layer “b” a good index fossil?
It’s
not found all over the place.Slide22
Index fossils are _ _ _ _spread but existed _ _ _ _ _
ly
.
index fossils are in a thin layer AND ALL OVER Slide23
Index fossils are widespread but existed briefly.
index fossils are in a thin layer AND ALL OVER Slide24
INDEX fossils help DATE
Earth’s
GEOLOGIC layers
!Slide25
tiered activity…Slide26
Which fossil below would make the best INDEX FOSSIL?
T
I
M
E
P
E
R
I
O
D
S
Slide27
Which fossil below would make the best INDEX FOSSIL?
T
I
M
E
P
E
R
I
O
D
S
Slide28
Would fossils of cockroaches make for good index fossils?
49 million year old cockroach fossil.Slide29
Would fossils of cockroaches make for good index fossils?
125 million year old cockroach fossil.Slide30
Would fossils of cockroaches make for good index fossils?
Cockroaches would NOT make good index fossils. They are widespread, but have existed for hundreds of millions of years in many different layers!Slide31
Say humans were destroyed by a plague. Millions of years from now, aliens found human fossils buried deep under Earth, would fossilized humans be good index fossils?Slide32
Say humans were destroyed by a plague. Millions of years from now, aliens found human fossils buried deep under Earth, would fossilized humans be good index fossils? YES!
Were we widespread over Earth? YES.
Did we exist briefly? YESSlide33
Human trace or remains would make GREAT index fossils because we have only been here for a few thousand years but have been all over the planet!Slide34
end…