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GEOLOGIC TIME SCALE.notebook January 29, 2020
Bellwork: Jan. 29th
x Turn in half-life lab
x :ork from substitute teacher will NOT be accepted late.
x Get out 9.2 9.3 reading notes due next Tues
x Unit 8 Test postponed until Tuesday.
1. In the half-life lab, why did we use the
data from all 10 groups rather than the
data from Must your group"
2. Explain how radioactive decay is used to
estimate the age of fossils and rocks.
Jan 29-10:04 AM
GEOLOGICAL TIME SCALE
Jan 20-9:23 AM
1
GEOLOGIC TIME SCALE.notebook January 29, 2020
GEOLOGICAL TIME SCALE
MESOZOIC ERACENOZOIC ERA
PALEOZOIC ERA
HADEAN EON
ARCHEAN EON PROTEROZOIC EON
PHANEROZOIC EON
0.01
2500
4500
65.5
3800
570
245
MYA
Nov 21-10:02 AM
P
H
A CENOZOIC ERA 0.01 - 65.5 MYA
N
E
R
O
Z MESOZOIC ERA 65.5- 245 MYA
O
I
C
E
PALEOZOIC ERA 245-570 MYA
O
N
PROTEROZOIC EON 570-2500 MYA
ARCHEAN HADEAN EON 2500-4600 MYA
GEOLOGICAL TIME SCALE
MESOZOIC ERACENOZOIC ERA
PALEOZOIC ERA
HADEAN EON
ARCHEAN EON PROTEROZOIC EON
PHANEROZOIC EON
0.01
2500
4500
3800 65.5
570
245
MYA
A Brief History of Geological Time video
Nov 21-10:02 AM
2
GEOLOGIC TIME SCALE.notebook January 29, 2020
ARCHEAN EON 2500 - 3800 MYA
3800 - 4600 MYA
HADEAN
Hadean Eon
x Earth was as hot as Hades
x Formation of the Earth
Archean eon
x Greek "origin"
x atmosphere was mostly CO
2
st
x 1 life forms flourished
fossil
x life was anaerobic bacteria
! didn
t need O
2
! single-celled organisms
x fossils of stromatolites colonies of bacteria
living Australia
-
bacteria
Nov 21-10:16 AM
PROTEROZOIC EON 570-2500 MYA
x Protero - "early" Zoic - "life"
x Photosynthtic organisms increase the amount of O in the
2
atmosphere
x Eukaryotes appear Complex cells
x NO LIFE ON LAND
x SIMPLE MARINE ORGANISMS ALGAE, FUNGI, :ORMS,
PLAN.TON
x Few fossils.
x Earth is still HOT Volcanic activity, igneous metamorphic rock
formation
THE ARCHEAN EON AND PROTEROZOIC EON ARE
OFTEN REFERRED TO AS THE PRECAMBRIAN.
What_is_the_PrecaPErian_.asf
Nov 22-2:22 PM
3
GEOLOGIC TIME SCALE.notebook January 29, 2020
P
H
A CENOZOIC ERA 0.01 - 65.5 MYA
N
E
R
O
Z
MESOZOIC ERA 65.5- 245 MYA
O
I
C
E
PALEOZOIC ERA 245-570 MYA
O
N
n
a
i
r
PROTEROZOIC EON 570-2500 MYA
b
m
a
c
e
ARCHEAN HADEAN EON r 2500-4600 MYA
P
GEOLOGICAL TIME SCALE
MESOZOIC ERACENOZOIC ERA
PALEOZOIC ERA
HADEAN EON
ARCHEAN EON PROTEROZOIC EON
PHANEROZOIC EON
0.01
4500 2500
65.5
3800
570
245
MYA
Nov 21-10:02 AM
PHANEROZOIC EON 570 TO 0.01 MYA
What_is_the_Phanerozoic_Eon_.asf
0.01 MYA
CENOZOIC ERA
What_is_the_Cenozoic_Era_.asf
PHANEROZOIC
MESOZOIC ERA
EON
What_is_the_Mesozoic_Era_.asf
"visible life"
570 MYA
PALEOZOIC ERA
What_is_the_Paleozoic_Era_.asf
Nov 22-2:22 PM
4
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