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GEOLOGIC TIME SCALE
PRECAMBRIAN ERAPRECAMBRIAN ERA
5,000 – 544 MYA.The beginnings of
life, approximately 1,200 MYA.
Single and multiple celled organisms-lived in water.
5,000 – 544 MYA.The beginnings of
life, approximately 1,200 MYA.
Single and multiple celled organisms-lived in water.
CyanobacteriaCyanobacteria
prokaryote, no nucleus.
prokaryote, no nucleus.
PALEOZOIC ERAPALEOZOIC ERA
544 - 245 MYA. The evolution of life
in the sea and on land.
Divided into 7 Periods: Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian.
544 - 245 MYA. The evolution of life
in the sea and on land.
Divided into 7 Periods: Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian.
Cambrian periodCambrian period
544 – 505 MYA.544 – 505 MYA.
Cambrian periodCambrian period
Great variety of marine invertebrates.
Great variety of marine invertebrates.
Ordovician periodOrdovician period
438 – 505 MYA.First fish began to
appear.
438 – 505 MYA.First fish began to
appear.
Silurian periodSilurian period
408 – 438 MYA.First land plants
form.
408 – 438 MYA.First land plants
form.
CoralCoral
coral reefs & cephalopods abundant.
coral reefs & cephalopods abundant.
Devonian periodDevonian period
360 – 408 MYA.First land dwelling
creatures appear.First amphibians.
360 – 408 MYA.First land dwelling
creatures appear.First amphibians.
Devonian OceanDevonian Ocean
Mississippian periodMississippian period
320 – 360 MYA.Insects evolve.First fully
terrestrial creatures evolve.
320 – 360 MYA.Insects evolve.First fully
terrestrial creatures evolve.
Pennsylvanian PeriodPennsylvanian Period
286 – 320 MYA.Reptiles evolve.
286 – 320 MYA.Reptiles evolve.
Pennsylvanian Period Pennsylvanian Period
Swampy, future coal beds.
Swampy, future coal beds.
Permian periodPermian period
245 – 286 MYA.Largest mass extinctions. 90-95%
marine invertebrates became extinct.Reptiles getting bigger and stronger.
245 – 286 MYA.Largest mass extinctions. 90-95%
marine invertebrates became extinct.Reptiles getting bigger and stronger.
MESOZOIC ERAMESOZOIC ERA
“Age of the Dinosaurs”
66 – 245 MYA.Three periods:
Cretaceous, Jurassic, Triassic.
“Age of the Dinosaurs”
66 – 245 MYA.Three periods:
Cretaceous, Jurassic, Triassic.
Triassic PeriodTriassic Period
208 – 245 MYA.First mammals.Reptiles ruled.
208 – 245 MYA.First mammals.Reptiles ruled.
Jurassic PeriodJurassic Period
144 – 208 MYA.144 – 208 MYA.
Jurassic PeriodJurassic Period
Dinosaurs dominant.
Dinosaurs dominant.
Jurassic PeriodJurassic Period
First birds begin to appear.
First birds begin to appear.
Cretaceous PeriodCretaceous Period
66 – 144 MYA.Last period of
dinosaurs.Largest dinosaurs.
66 – 144 MYA.Last period of
dinosaurs.Largest dinosaurs.
CENOZOIC ERACENOZOIC ERA
Began at the extinction of the dinosaurs.
Present to 66 MYA.
Rise of the mammal.
Began at the extinction of the dinosaurs.
Present to 66 MYA.
Rise of the mammal.
Tertiary PeriodTertiary Period
1.5 – 66 MYA.Flowering plants
dominate.Mammals
dominate.
1.5 – 66 MYA.Flowering plants
dominate.Mammals
dominate.
Tertiary PeriodTertiary Period
Quaternary PeriodQuaternary Period
Present – 1.6 MYA.
Present – 1.6 MYA.
Quaternary PeriodQuaternary Period
Evolution of humans.
Evolution of humans.
Human evolutionHuman evolution
Extinctions and VariationsExtinctions and Variations
