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Geologic Time Scale
The division of Earth’s history based on life forms which lived during that period
Precambrian
trace fossils, which are the remains or evidence of the activity appear
Precambrian
single – celled organisms
Cambrian
diverse life forms in oceans
Paleozoic
= Era of Ancient life
Paleozoic
= marine life; life mostly found in oceans
Cenozoic
The Era of which the first human appears
Cenozoic
the Era we live in
Mesozoic
“Jurassic Park”
Mesozoic
earliest dinosaur appears
Mesozoic
= dominant animals are the reptiles
Mesozoic
= Era of Middle life
Devonian Period
= also known as “The Age of Fish”
Orosirian Period
geologic period that the earth become oxygen rich
Ordovician Period
first green plants and fungi appeared on land
Jurassic Period
= the first birds and lizards appeared on earth
Asteroid Impact
extinction of dinosaurs
Carboniferous Period
the age of earth did terrestrial life was well establish
Cretaceous Period
the maximum diversity of reptiles occurs
Cretaceous Period
= flowering plants first appeared
Mid Cretaceous
= angiosperm originated
Holocene
= the present epoch in the Earth’s age
Holocene
mainly characterized by the rise of human civilization
the first multicellular organisms appear
1 billion years ago
life first appear on Earth
3. 5 billion years ago
age of the earth by the latest radiometric dating
4.54 billion years
Major Eons in Earth’s History
Archean, Proterozoic, Phanerozoic
DNA
molecule modified in genetic engineering
Medicinal Application
Production of antibiotics, hormone and vaccines
Agricultural Application
= Crop Improvement
