Prehistory 1:
Geologic
Time
ppt. by Robin D. Seamon
Resource: TEXTBOOK:
Prentice Hall Earth Science
notes
http://home.eart...
HIGHLIGHTS:
• Earth: 4.5 billion years old
• ¾ of the geologic timeline holds life
• Life forms changed Earth’s chemistry
...
Geologic Time Scale
Geologic
Timeline in
Excel
LINK
Neogene
Paleogene
EXTINCTIONS: widespread & rapid decreases in
amount of life on Earth.
5 major Extinctions:
65
mya
K-Pg Extinction 75% exti...
Mass extinctions:
• Long-term stress compounded by short-term
shock (2 things)
POSSIBLE CAUSES
• Flood basalt events (LIP)...
• Plate tectonics
• Initiate/end Ice Ages
• Change ocean & wind patterns
• Close off or open land bridges
• Decrease conti...
EFFECTS & RECOVERY
• Weedy species- species that can quickly adapt
to the environment; becomes dominate
• Reproduce quickl...
Geologic Timeline CALENDAR LAB
If Earth’s whole history was
compressed into 1 year, each
day would represent 12.5
million ...
PH1 UNIT CHECK1
1. Age of the Earth according to geologists
2. How many major extinctions has Earth experienced?
3. How lo...
Precambrian Era: Vast and Puzzling
 4.5 Billion years ago to the Cambrian Period
 3.4 bya: microscopic bacteria
 Atmosp...
Precambrian Era: Vast and Puzzling
 Fossils:
* stromatolites: layered mounds and columns of
calcium carbonate (material d...
Remnants of Precambrian Rocks
 After Precambrian Era, time is divided into 3
other eras:
* Paleozoic Era
(Invertebrates Fish Amphibians)
* Mesozoic Era...
Early Paleozoic Era: Life Evolves
 540 mya
 Divided into 6 time periods:
* Cambrian Period
* Ordovician Period
* Siluria...
Early Paleozoic Era: Life Evolves
Land masses:
* First: Gondwana ( S. Amer, Africa, Australia,
Antarctica, Asia) MAP
*Then...
BACK
Cambrian Period: “Age of Invertebrates”
first organisms with shells, trilobites dominate
Ordovician Period: first fish
Sil...
Late Paleozoic Era
 At the end of the Paleozoic Era, (400mya)
plants adapted to water’s edge to inland
 Amphibians diver...
Silurian Period
BACK
BACK
Ordovician Period
Armor-Plated Fish
BACK
Model of a Pennsylvanian
Coal Swamp
BACK
Permian Period Reptiles
ADVANCE
Mesozoic Era: “Age of Reptiles”
 350 mya
 Divided into 3 time periods:
* Triassic Period
* Jurassic Period
* Cretaceous ...
Mesozoic Era: “Age of Reptiles”
 Life:
* gymnosperms
* Canadian Rockies formed
* shelled egg: adaptation favoring land bi...
BACK
The Flying Reptile Pteranodon
ADVANCE
Fossil Skull of an Extinct Crocodile
Periods of the Mesozoic Era
Triassic Period “Age of Reptiles”
Dinosaurs dominate
Jurassic Period
First birds, dinosaurs do...
Jurassic Period
BACK
Cretaceous Period
MASS EXTINCTION!!!
K-Pg Boundary- Earth struck by 6-mile wide asteroid,
resulting in mass extinction: 65 mya
End of the Me...
Cenozoic Era: “Age of Mammals”
 65 mya
 Considered the “Age of Mammals”
 Divided into three periods
* Paleogene Period
...
Cenozoic Era: “Age of Mammals”
 Angiosperms replace gymnosperms as
dominate land plants
 Mammals (animals that bear live...
Fossils from La Brea Tar Pits
Cenozoic Era: “Age of Mammals”
 Life
Large mammals & extinction:
* In N. America, mastodon & mammoth
(huge relatives of e...
Cenozoic Era: “Age of Mammals”
Mastadon
Wooly mammoth
Cenozoic Era: “Age of Mammals”
Saber-toothed tiger
Giant ground sloth
Cenozoic Era: Human Ancestors
2 mya – 10mya humans?
PH1 UNIT CHECK1
Reader’s Theater:
North American History
Character
LINK
Script
LINK
LAB:
Geologic Beaded
Timeline
LAB Activity:
Group Timeline Project
Precambrian Paleozoic Mesozoic Cenozoic
Cambrian
Your timeline should include in pict...
COMPUTER LAB Activity:
Geologic Timeline in Excel
LINK
RESOURCE:
TEXTBOOK: Prentice Hall Earth Science
notes 6th grade
Prehistory 1: Geologic Timeline-  Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era
Prehistory 1: Geologic Timeline-  Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era
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Prehistory 1: Geologic Timeline- Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era

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  • Prehistory 1: Geologic Timeline- Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era

    1. 1. Prehistory 1: Geologic Time ppt. by Robin D. Seamon Resource: TEXTBOOK: Prentice Hall Earth Science notes http://home.earthlink.net/~tran qbase/images/fossils.jpg
    2. 2. 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 VIDEO: How Much is A Million?
    3. 3. Geologic Time Scale Geologic Timeline in Excel LINK Neogene Paleogene
    4. 4. EXTINCTIONS: widespread & rapid decreases in amount of life on Earth. 5 major Extinctions: 65 mya K-Pg Extinction 75% extinct (killed dinosaurs) Mammals & birds survive 200 mya Triassic-Jurassic extinction event 75% extinct Dinos & birds survive 251 mya Permian-Triassic extinction event 95% life extinct “Great Dying” Archosaurs survive 375 mya Devonian extinction 70% extinct Marine life changed 450 mya Ordovician- Silurian extinction 70% extinct X 2 2 events
    5. 5. 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)
    6. 6. • 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
    7. 7. 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
    8. 8. Geologic Timeline CALENDAR LAB If Earth’s whole history was compressed into 1 year, each day would represent 12.5 million years. According to this calendar, animals & plants didn’t evolve on Earth until the late Fall. First fish started crawling onto land, evolving into amphibious creatures with legs in early December Primates (group that today contains lemurs, monkeys, humans) only appeared in the last week of December.
    9. 9. PH1 UNIT CHECK1 1. Age of the Earth according to geologists 2. How many major extinctions has Earth experienced? 3. How long does it take for biological re-diversification to happen on Earth? 4-5. Name two supercontinents that were once on the Earth. 6. What is the species that is able to withstand the environmental changes and resulting mass extinctions? They repopulate Earth. A- Mesozoic Era B- Paleozoic Era C- Cenozoic Era D- Precambrian 1. Era in which we live 2. Era in which dinosaurs were dominant 3. Era in which fish and marine animals were dominant 4. Earliest time period- only bacteria 4.5 billion years old 5 5-10 million years Rodinia, Pangaea Weedy species C A B D
    10. 10. 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: water protects  Later, primary plants evolved, used photosynthesis which created oxygen  Oxygen accumulates 2.5 bya
    11. 11. Precambrian Era: Vast and Puzzling  Fossils: * stromatolites: layered mounds and columns of calcium carbonate (material deposited by algae) * 600 mya 1st multi-celled animals  EXTINCTION
    12. 12. Remnants of Precambrian Rocks
    13. 13.  After Precambrian Era, time is divided into 3 other eras: * Paleozoic Era (Invertebrates Fish Amphibians) * Mesozoic Era * Cenozoic Era
    14. 14. 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
    15. 15. 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: Pangaea (all continents together) MAP ADVANCE
    16. 16. BACK
    17. 17. 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
    18. 18. 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
    19. 19. Silurian Period BACK
    20. 20. BACK Ordovician Period
    21. 21. Armor-Plated Fish BACK
    22. 22. Model of a Pennsylvanian Coal Swamp BACK
    23. 23. Permian Period Reptiles ADVANCE
    24. 24. 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
    25. 25. Mesozoic Era: “Age of Reptiles”  Life: * gymnosperms * Canadian Rockies formed * shelled egg: adaptation favoring land birth IMPORTANT EVOLUTIONARY STEP * Reptiles dominate ADVANCE
    26. 26. BACK
    27. 27. The Flying Reptile Pteranodon ADVANCE
    28. 28. Fossil Skull of an Extinct Crocodile
    29. 29. 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
    30. 30. Jurassic Period BACK
    31. 31. Cretaceous Period
    32. 32. 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
    33. 33. Cenozoic Era: “Age of Mammals”  65 mya  Considered the “Age of Mammals”  Divided into three periods * Paleogene Period * Neogene Period * Quaternary Period  Plate movement led to much mountain building, volcanism, earthquakes
    34. 34. 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
    35. 35. Fossils from La Brea Tar Pits
    36. 36. 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???
    37. 37. Cenozoic Era: “Age of Mammals” Mastadon Wooly mammoth
    38. 38. Cenozoic Era: “Age of Mammals” Saber-toothed tiger Giant ground sloth
    39. 39. Cenozoic Era: Human Ancestors 2 mya – 10mya humans?
    40. 40. PH1 UNIT CHECK1
    41. 41. Reader’s Theater: North American History Character LINK Script LINK
    42. 42. LAB: Geologic Beaded Timeline
    43. 43. 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?
    44. 44. COMPUTER LAB Activity: Geologic Timeline in Excel LINK
    45. 45. RESOURCE: TEXTBOOK: Prentice Hall Earth Science notes 6th grade

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