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![Page 1: - A scale that subdivides the 4.5- billion-year history of Earth into many different units and provides a meaningful time frame within which the events.](https://reader035.fdocuments.us/reader035/viewer/2022081519/56649e7b5503460f94b7d30e/html5/thumbnails/1.jpg)
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- A scale that subdivides the 4.5-billion-year history of Earth into many different units and provides a meaningful time frame within which the events of the geologic past are arranged.
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EON ERA PERIOD EPOCH
PHANEROZOIC
CENOZOIC
QUATERNARY HOLOCENE
PLEISTOCENE
TERTIARY PLIOCENE
MIOCENE
OLIGOCENE
EOCENE
PALEOCENE
MESOZOIC CRETACEOUS “Age of Reptiles”JURASSIC
TRIASSIC
PALEOZOIC
PERMIAN “Age of Amphibians”CARBONI-
FEROUSPENNSYLVANIAN
MISSISSIPPIAN
DEVONIAN “Age of Fishes”SILURIAN
ORDOVICIAN “Age of Invertebrates”CAMBRIAN
PRECAMBRIAN
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EON• Two or more geological eras
form an Eon, which is the largest division of geologic time, lasting many hundreds of millions of years.
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PRECAMBRIAN- means: "before the Cambrian
period." - From 4.6 billion years ago to the
beginning of the Cambrian Period (about 570 mya)
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- It is actually composed of three Eons: HADEAN, ARCHEAN, AND PROTEROZOIC.
- The Precambrian represents about 88 % of the Geologic Time.
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HADEAN EON• Hadean ("Hades-like") Eon. • 4.5 to 3.9 billion years ago• During this era the surface of the Earth was
like popular visions about Hades: oceans of liquid rock, boiling sulfur, and impact craters everywhere.
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HADEAN EARTH("Hades-like")
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ARCHEAN EON• Archean ("Ancient" or "Primitive") Eon.• 3.9 to 2.5 billion years ago• This eon began about a billion years after the
formation of the earth, and things have changed a lot! Mostly everything has cooled down. Most of the water vapor that was in the air has cooled and condensed to form a global ocean.
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ARCHEAN EARTH("Ancient" or "Primitive")
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The first life forms evolve - one celled organisms.
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The cyanobacteria or "blue-green algae," have left a fossil record that extends far back into the Precambrian - the oldest cyanobacteria-like fossils known are nearly 3.5 billion years old, among the oldest fossils currently
known.
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PROTEROZOIC EON
• 2.5 billion years ago to 540 mya• First multicellular life: colonial
algae and soft-bodied invertebrates appear. Oxygen build-up in the Mid-Proterozoic.
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PROTEROZOIC EARTH("Early Life")
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PHANEROZOIC EON- Is derived from Greek words
meaning visible life.- It is an appropriate description
because the rocks and deposits of the Phanerozoic eon contain abundant fossils that document major evolutionary trends.
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- It is composed of three eras: PALEOZOIC, MESOZOIC, and CENOZOIC.
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ERA• Two or more geological
periods comprise an era, which is hundreds of millions of years in duration.
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PALEOZOIC ERA• Paleo = ancient zoe = life• 540 to 248 mya • At its beginning, multicelled animals
underwent a dramatic "explosion" in diversity, and almost all living animal phyla appeared within a few millions of years.
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• At the other end of the Paleozoic, the largest mass extinction in history wiped out approximately 90% of all marine animal species.
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MESOZOIC ERA
• Meso = Middle zoe = life• "THE AGE OF REPTILES"• from 248 million to 65 million
years ago.
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• The continents were jammed together at the beginning of the Mesozoic Era, forming the supercontinent of Pangaea, but would start breaking apart toward the middle of the Mesozoic Era.
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CENOZOIC ERA• Ceno = recent zoe = life• 65 Million Years to the Present• sometimes called the “Age of
Mammals”
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PERIODThe period is the basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years.
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PALEOZOIC ERAPERMIAN
CARBONIFEROUS PENNSYLVANIAN
MISSISSIPPIAN
DEVONIAN
SILURIAN
ORDOVICIAN
CAMBRIAN
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MESOZOIC ERA
CRETACEOUS
JURASSIC
TRIASSIC
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CENOZOIC ERA
•QUATERNARY•TERTIARY
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