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The Geologic Time Scale Mass extinctions The Geologic Time Scale Mass extinctions

The Geologic Time Scale Mass extinctions - PowerPoint Presentation

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The Geologic Time Scale Mass extinctions - PPT Presentation

999 of all living things that have ever existed on earth have gone extinct earth has experienced 5 five extinctions Geologic time scale Era Largest unit of geologic time lasts tens to hundreds of millions of years and consists of two or more periods ID: 781024

climate life mya atmosphere life climate atmosphere mya sea glaciers geologic tropical time abundant era warm age plants form

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Presentation Transcript

Slide1

The Geologic

Time Scale

Slide2

Slide3

Mass extinctions

99.9% of all living things that have ever existed on earth have gone extinct earth has experienced 5 five extinctions

Slide4

Geologic time scale

Era

Largest unit of geologic time

lasts tens to hundreds of millions of years and consists of two or more periods.

Period

Divides Eras

Most commonly used units of time scale

Lasts millions of years

Each is associated with a particular rock system

Epochs

Divide PeriodsSmallest unit of geologic timeLasts several million years

Slide5

Pre Cambrian

Life

Climate/Atmosphere

Bacteria,

sponges

CH4, NH3, H2, C

Volcanic eruptions, lightening

Some areas

freeze

Slide6

Paleozoic

ERa

Slide7

Cambrian544-505

mya

Life

Climate/Atmosphere

“Cambrian Explosion” = jellyfish, starfish,

worms, sea scorpions

Trilobites dominant

Warm/tropical

No glaciation

Slide8

Ordovician505-440

mya

Life

Climate/Atmosphere

Mass extinctions

of marine life

Invertebrates dominant

Starfish, clams, oysters, squids, octopuses

Land

masses gather at south pole

Massive glacier

form

dropping sea levels

Slide9

Silurian440-410

mya

Life

Climate/Atmosphere

Earliest

land plants

First

Jawfishes

Trilobites, sea scorpions, mollusks still common

Pangea

forms

Tropical climate

Glaciers melt

Ocean rises

Warm shallow seas form

Slide10

Devonian410-360

mya

Life

Climate/Atmosphere

First sharks, amphibians,

insects, and trees

Extinction of armored fish

Very warm

Slide11

Carboniferous360-286

mya

Life

Climate/Atmosphere

Amphibians,

winged insects, small reptiles, and conifers and ferns

Warm

tropical areas

Glaciers at poles

Slide12

Permian286 – 245

mya

Life

Climate/Atmosphere

Centipedes, spiders, and cockroaches

Seed plants

Reptiles

abundant

Beetles first appear

Many inverts go extinct

Temperatures increase

Sea levels rise

Slide13

Mesozoic era

Slide14

Triassic245-208

mya

Life

Climate/Atmosphere

Turtles, crocodiles, and

lizards appear

Sharks, sea urchins,

seastars

are abundant

Early dinosaurs

(ex.

placodont

)

Sea levels rise

land is very dry and hot.

glaciers melting.

Slide15

Jurassic208-146

mya

Life

Climate/Atmosphere

Insects, sharks, crocodiles, and fish are

abundant

The earliest mammals

appear.

Early

dinosaurs are abundant

Hot

No glaciers

Slide16

Cretaceous146-65

mya

Life

Climate/Atmosphere

“Age of

the Dinosaurs”

Flowering plants and bees

Pangea

splits apart creating more coastline

Seasons begin to form

Slide17

Cenozoic era

Slide18

Tertiary65-1.8

mya

Life

Climate/Atmosphere

“Age of Mammals”

Grasslands, forests, palm

trees, kelp forests

Birds evolve

Started

tropical and then started to cool

Continents crashed into each other creating mountains

Slide19

Quarternary

1.8 mya- present

Life

Climate/Atmosphere

First

appearance of woolly mammoth, giant sloth, saber-toothed cats

Went through

an ice age

Temps warmed and continue to

Slide20