Eras of Earth's History

Eras of Earth's History

Eras of Earths History EQ: What causes changes in the Earth? How does knowing the past give us a VISION for the future? Precambrian Time Eon Precambrian Time Eon 4.6 billion years ago-545 million years ago Information about this time on Earth is SCARCE Rocks are buried deep within Earths Crust

Information on rocks damaged or destroyed by Earths inner heat and pressure of other rock layers Moon forms during this time Precambrian Eon continued. Earth originally thought to be dead Volcanoes produce toxic atmosphere Water and water Vapor that form the oceans comes from volcanoes,

asteroids and comets!!! *Precambrian Eon continued.* Closer look at rocks show Signs of cynobacteria Cynobacteria-changed Earths past atmosphere of water vapor, ammonia and methane into Nitrogen and Oxygen: STILL FOUND ALIVE TODAY in deep sea Thermal Vents and in volcanoes Todays atmosphere made up of

nitrogen , oxygen and water vapor Phanerozoic Eon (3 Eras) *Paleozoic

Era: 545-245m.y.a.: Basic Traits* The longest of all the Eras on the Earth Contains 7 periods Fossils of large organisms first found in this era Almost all are marine environment Largest land Continent called Gondwana (begins with 90 % of Earths surface covered by water)

Warm Earth; Life limited to oceans; ozone layer not fully developed: no plants on land intially Ends with the largest mass extinction in Earths history (90% of all life killed) *Why did life first start in the ocean?* More stable environment: Water 22x heat capacity than air

UV Protection: DNA Damaged by UV radiation DNA contains all information for life Earths ozone layer just starting to develop from oxygen produced by cynobacteria *Why did life first start in the ocean?* Gravitys affect

neutralized -organisms would develop in environment in which gravity would have no impact on animals structure NO need for powerful muscles to move *Why did life first start in the ocean?*

Easier to obtain minerals and gases necessary for life Water naturally has these items dissolved in it Organisms could just absorb materials as water passed by *Easier to obtain food* Food would be

suspended in 3 dimensions: filter feeding or feeding with tentacles become popular 7 periods of Paleozoic Era Cambrian Period (545- 505) Trilobites Clams

Inland seas suggest warm Earth Land Formation: supercontinent Gondwana; (S hemisphere) Ordovician Period (505-438) First land plants (ferns) First vertebrates: early fish appear Life moves into shallower

water: Suggests ozone layer almost fully developed as life moves closer to land Laurussia seperates from Gondwana Silurian Period (438-408) Corals Dominate Worlds

Oceans Warm Earth Plants move further inland Animals now moving further inland by way of water; fresh water fish N. America covered by shallow sea *Devonian Period (408-360)* Fish dominate oceans

First amphibians Signs of Earth beginning to cool: Water retreats forcing organisms to adapt to the new changes. More land created Mississippian Period (360-320) Amphibians dominate land life

Earth much cooler as glaciers move southward from polar regions Cooler Earth forces Amphibians to adapt to changes; (less water-thicker skin) Pennsylvanian Period (320-286) First reptiles and insects

Shallow seas over N.America almost disappeared Cooler Earth *Permian Period (286-245)* Glaciers retreat Earth Warming back up Ends with largest mass extinction in fossil record (Asteroid impact)

*Mesozoic Era * AGE OF DINOSAURS 245-65 Million Years Ago Split into 3 major periods Triassic period (245-208 million years) Jurassic Period (208-144 million years) Cretaceous Period (144-65 million years) Triassic Period Marks beginning of Mesozoic Era First dinosaurs and mammals appeared

around 225 million years ago Atlantic Ocean Pangaea breaks up Flowering Plants appear Eoraptor, Plateosaurus and Teratosaurus *Why Dinosaurs Evolve* Environmental Factors- As Pangaea break apart each land mass gets a unique climate

Disease Influence- Diseases possible reason species die out Competition for Food- organisms compete for same food sources; winners live losers die Predatory Influence- animals develop defenses against Predators Jurassic Period (208-144) Flowering Plants and Dinosaurs dominate land Birds appear Appalachian Mountains Form Dinosaurs become more diverse from basic shapes

Allosaurus Stegosaurus Diplodicus Ceratosaurus Cretaceous Period (144-65) Most advanced dinosaurs: Highly specialized, most successful of all dinosaur species Modern Earth Appears Ends in Mass Extinction of Dinosaurs Tyrannosaurs, Tricerotops, Ankylosaurus,

Protocerotype, Velocoraptors, Pterodactyl Comparison of the Dinosaurs Triassic Jurassic Cretaceous small (Stegosaurus) Med- large

T-rex, Triceraptops, Raptors Largest Cold blooded Warm blooded Warm blooded Reptile-like

More Advanced Most Advanced/ Bird like in many ways Simple body plans 4 legs herbivores 2 legs carnivores Defenses against Preadtors Most advanced features

Hollow bones (t rex, raptors) Proto-feathers on skin Each continent had its own unique Dinosaurs *Meteorite Theory?* Says that asteroid/comet 3-5 miles wide struck near Yucatan Peninsula and caused Dinosaur Extinction Iridium deposits in KT layer help support this

However, closest Dinosaur bones ever found date about 1,000 prior to event Climate Change/Disease reason for extinction?? *Cenozoic Era* Continents were drifting apartpresent time of Earth African plate collided with European plate creating the Alps India slammed into Asian plate creating Himalayas

Climate was cooled causing several ice ages *Mammals Survive because* Small size easier to maintain body temperature in climate change Ability to Hibernate during an extreme event Mothers provide food for young from milk, No other organisms do this (mammals unique)

Cenozoic Era Age of Mammals (65mya- present day) 2 Periods Tertiary Period (65mya 1.6mya) Earths climate was warm and mild Ocean mammals like dolphins and whales evolve Land-insects, flowering plants and mammals, birds dominate Mega mammals mammals evolve Alps and Himalayas Form

Quaternary Period: (1.6 mya- today) Mega mammals die out/ (Climate Change?) Present period Humans appear100,000 years ago Grand Canyon forms Last ice age 15,000-10,000 years ago

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