prehistory 1: geologic timeline- notes on the geologic & life history of earth from precambrian...
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Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic EraTRANSCRIPT
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Prehistory 1:
Geologic
Timeppt. by Robin D. Seamon
Resource: TEXTBOOK:
Prentice Hall Earth Science
notes
http://home.earthlink.net/~tran
qbase/images/fossils.jpg
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HIGHLIGHTS:
• Earth: 4.5 billion years old
• ¾ of the geologic timeline holds life
• Life forms changed Earth’s chemistry
• Catastrophes affected the evolution of life-
extinctions
• New weedy species thrives & takes over after
an extinction
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EXTINCTIONS: widespread & rapid decreases in
amount of life on Earth.
5 major Extinctions:
65
myaK-Pg Extinction 75% extinct
(killed
dinosaurs)
Mammals &
birds survive
200
myaTriassic-Jurassic
extinction event75% extinct Dinos & birds
survive
251
myaPermian-Triassic
extinction event95% life extinct
“Great Dying”
Archosaurs
survive
375
myaDevonian
extinction70% extinct Marine life
changed
450
myaOrdovician-
Silurian extinction70% extinct X 2 2 events
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Mass extinctions:
• Long-term stress compounded by short-term
shock (2 things)
POSSIBLE CAUSES
• Flood basalt events (LIP)
• Sea level falls
• Impact events (asteroid/comet)
• Sustained & significant global cooling
• Sustained & significant global warming
• Anoxic events: (lack of O in oceans-warming)
• Oceanic overturn (disruption of thermohaline
circulation)
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• Plate tectonics
• Initiate/end Ice Ages
• Change ocean & wind patterns
• Close off or open land bridges
• Decrease continental shelf
• Arid interior
• OTHER:
• New disease
• Out-competition
• Man-made extinction of species
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EFFECTS & RECOVERY
• Weedy species- species that can quickly adapt
to the environment; becomes dominate
• Reproduce quickly
• Disperse widely
• Live in a variety of habitats
• Establish populations in strange places
• Resist eradication once established
• 5-10 million years before re-diversification
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Precambrian Era: Vast and Puzzling
4.5 Billion years ago to the Cambrian Period
3.4 bya: microscopic bacteria
Atmosphere: water vapor, CO2 , Nitrogen,
NO OXYGEN
Ozone layer protects from UV
Later, primary plants evolved, used
photosynthesis which created oxygen
Oxygen accumulates 2.5 bya
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Precambrian Era: Vast and Puzzling
Fossils:
* stromatolites: layered mounds and columns of
calcium carbonate (material deposited by algae)
* chert: hard sedimentary rocks holding these
fossils
600 mya 1st multi-celled animals
EXTINCTION
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Remnants of Precambrian Rocks
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After Precambrian Era, time is divided into 3
other eras:
* Paleozoic Era
(Invertebrates Fish Amphibians)
* Mesozoic Era
* Cenozoic Era
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Early Paleozoic Era: Life Evolves
540 mya
Divided into 6 time periods:
* Cambrian Period
* Ordovician Period
* Silurian Period
* Devonian Period
* Carboniferous Period
* Permian Period
Paleozoic Era
LIFE EVOLVES
early life began in the seas
shells, trilobites
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Early Paleozoic Era: Life Evolves
Land masses:
* First: Gondwana ( S. Amer, Africa, Australia,
Antarctica, Asia) MAP
*Then another mass is raised: Laurasia
(N. Amer, Eurasia) MAP
* Then in Permian Period, there was: Pangea
(all continents together) MAP
ADVANCE
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BACK
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Cambrian Period: “Age of Invertebrates”
first organisms with shells, trilobites dominate
Ordovician Period: first fish
Silurian Period: “Age of Fishes”
first land plants
Devonian Period:
fish dominate, first insect fossils
Carboniferous Period: “Age of Amphibians”
amphibians abundant, large coal swamps,
Permian Period: extinction trilobites & other marine
animals; first reptiles
Periods of the Paleozoic Era
ppt LINK
ppt LINK
ppt LINK
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Late Paleozoic Era
At the end of the Paleozoic Era, (400mya)
plants adapted to water’s edge to inland
Amphibians diversified
Greatest of 5 mass extinctions
(Climate became seasonal)
ADVANCE
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Silurian Period
BACK
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BACK
Ordovician Period
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Armor-Plated Fish
BACK
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Model of a Pennsylvanian
Coal Swamp
BACK
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Permian Period Reptiles
ADVANCE
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Mesozoic Era: “Age of Reptiles”
350 mya
Divided into 3 time periods:
* Triassic Period
* Jurassic Period
* Cretaceous Period
Dinosaurs were land-dwelling reptiles that
were dominate during Mesozoic Era
Major event: breakup of Pangea
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Mesozoic Era: “Age of Reptiles”
Life:
* gymnosperms
* Canadian Rockies formed
* shelled egg: adaptation favoring land birth
IMPORTANT EVOLUTIONARY STEP
* Reptiles dominate
ADVANCE
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BACK
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The Flying Reptile Pteranodon
ADVANCE
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Fossil Skull of an Extinct Crocodile
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Periods of the Mesozoic Era
Triassic Period “Age of Reptiles”
Dinosaurs dominate
Jurassic Period
First birds, dinosaurs dominate
Cretaceous Period
First angiosperms (flowering plants)
ADVANCE
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Jurassic Period
BACK
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Cretaceous Period
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MASS EXTINCTION!!!
K-Pg Boundary- Earth struck by 6-mile wide asteroid,
resulting in mass extinction: 65 mya
End of the Mesozoic Era:
Badlands, SD
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Cenozoic Era: “Age of Mammals”
65 mya
Considered the “Age of Mammals”
Divided into two periods
* Tertiary Period
* Quaternary Period
Plate movement led to much mountain building,
volcanism, earthquakes
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Cenozoic Era: “Age of Mammals”
Angiosperms replace gymnosperms as
dominate land plants
Mammals (animals that bear live young,
maintain steady body temperature) replace
reptiles as dominate animal
adaptations such as insulating body hair, more
efficient heart & lungs, allow mammals to lead
more active lives
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Fossils from La Brea Tar Pits
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Cenozoic Era: “Age of Mammals”
Life
Large mammals & extinction:
* In N. America, mastodon & mammoth
(huge relatives of elephant), saber-toothed cats,
giant beavers, large ground sloths, horses,
camels, giant bison become extinct
???? WHY???
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Cenozoic Era: “Age of Mammals”
Mastadon
Wooly mammoth
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Cenozoic Era: “Age of Mammals”
Saber-toothed tiger
Giant ground sloth
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Cenozoic Era: Human Ancestors
2 mya – 10mya humans?
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Reader’s Theater:
North American History
Character
LINK
Script
LINK
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LAB:
Geologic Beaded
Timeline
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LAB Activity:
Group Timeline Project
Precambrian Paleozoic Mesozoic Cenozoic
Cambrian
Your timeline should include in pictures and words the following: (use
color)
Time ( - )
Era _____________, “Age of _________” Period
Geology
Atmosphere & weather
*New adaptations
plants, animals
Extinctions?
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RESOURCE:
TEXTBOOK: Prentice Hall Earth Science
notes 6th grade