the history of Earth's creation

1. Overview of Earth’s History
• Precambrian Period
During this period, Earth was thought to be a
hot steaming, and hostile landscape, with
the primitive crust of the newly formed
planet is only beginning to cool.
Precambrian period is divided into Hadean,
Archean and Proterozoic eons.

2. Hadean period
• During this period,
Earth is like hell due
to massive and
constantly exposed to
meteorites and
volcanic activities.

3. Archean period
• During this period,
plate tectonics
allowed crustal
building and the
formation of volcanic
belts and
sedimentary basins.

4. Proterozoic period
• Proterozoic era was marked
by the existence of
multicellular animal life. The
increase in the amount of
free oxygen is thought to be
a result of photosynthetic
action by primitive life forms
in the sea which includes
stromatolites
Stromatolite
Primitive Unicellular
Organisms

5. Phanerozoic Period
• This eon referred as “visible life”.
• It is divided into the Paleozoic, Mesozoic and
Cenozoic eras. the Paleozoic era is separated
into six periods namely: Cambrian,
Ordovician, Silurian, Devonian Permian and
Carboniferous.
• Devonian period is known as age of the fishes

6. Paleozoic era
• Marked the
beginning of life
as shown in a
fossil record.
These organisms
have hard shells
called
cephalopods.
1. Origin of Animals
with Skeletal Hard
Parts

7. Paleozoic (250 to 540 Ma.)
- Early Paleozoic (420 to 540 Ma.)
1. Origin of Animals with Skeletal Hard Parts

8. During the Early Paleozoic a rich diversity of sea life existed
Life is only restricted to the sea

9. 2. The
continents
are not
fixed. They
move - But,
very slowly

10. Late Paleozoic (250 to 420 Ma.)
3. Origin of Terrestrial Life
Toward the end of the Paleozoic
large forests consisting of fern
trees were established
-These swampy forests ultimately
generated most of the world’s coal

11. Also during the Late Paleozoic and the beginning of
carboniferous era, land animals evolved such as:
Insects
Amphibians
Reptiles

12. 4. Also toward the end of
the Late Paleozoic all of
the continents were
assembled to form the
supercontinent Pangaea
Gradual movement of
continents over
geologic time is called
continental drift.
5. Permian Extinction

13. Mesozoic era or known as age of Dinosaurs
1. Break-up of Pangaea
- The result: Formation of the Atlantic Ocean
2. Dinosaurs ruled the surface of the planet.

14. 3. During the Mesozoic other lifeforms developed
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15. 4. What happened at the end of the Mesozoic??
What caused the extinction of the dinosaurs?

16. The big one?
An impact of a
Comet or Asteriod

17. Where did this asteroid impact?

18. Cenozoic era is known as age of mammals
Global Cenozoic Plate Tectonics
- The Mesozoic was a period in which continents were
in general moving away from one another
- Exception: collision of India with Eurasia
Cenozoic Life
Mammals and flowering plants become dominant

19. 4. The Quaternary “Ice Age” (0 to 2 Ma.)
- Climate variability is the norm
Glacial versus interglacial periods
.during this age, mass extinction of mammoths,
mastodons and saber-toothed tigers occurred.

20. fossils
• Are remnants of any ancient animal
or plant that has been preserved in
rocks.
Relative dating only shows the
chronological order of events
without any reference to the unit of
time.

21. • Absolute dating is a method of
measuring the age of an object in
years. Scientist analyze the
isotopes of radioactive elements.
• Radiometric dating is a method of
measuring the age of an event or
object in years.