history of life on earth evolutionary timeline ms. herrera

History of Life on History of Life on EarthEarth

Evolutionary TIMELINEEvolutionary TIMELINEMs. HerreraMs. Herrera

►Earth is 4.6 billions years oldEarth is 4.6 billions years old

►1 billion= 1000 million1 billion= 1000 million

►1 trillion= 1000 billion1 trillion= 1000 billion

►How many millions of years old is earth?How many millions of years old is earth?►4600 million years4600 million years

PrecambriaPrecambriann

PaleozoicPaleozoic MesozoicMesozoic CenozoicCenozoic



4.6 bya4.6 bya Earth Earth FormsForms

2.2 bya2.2 bya 11stst oxygen oxygen producing producing bacteriabacteria

First First multicellulmulticellular ar organismsorganisms544 mya544 myaMass Mass ExtinctionExtinction





544 mya544 myaMass Mass ExtinctionExtinction

500 mya500 mya 11stst fish-”armorefish-”armored fish”d fish”410 mya410 mya 11stst amphibians amphibians invade landinvade land440 mya440 mya 11stst squid squid400 mya400 mya 11stst sharks & sharks & Small reptilesSmall reptiles







500 mya500 mya 11stst fish-”armorefish-”armored fish”d fish”440 mya440 mya 11stst squid squid410 mya410 mya 11stst amphibians amphibians invade landinvade land400 mya400 mya 11stst sharks & sharks & Small reptilesSmall reptiles


T - J - CT - J - C

Dinosaurs Dinosaurs DominateDominate

Flowering Flowering Plants Plants evolveevolve





2.2 bya2.2 bya 11stst oxygen oxygen producing producing bacteriabacteriaFirst First multicellulmulticellular ar organismsorganisms544 mya544 myaMass Mass ExtinctionExtinction

500 mya500 mya 11stst fish-”armorefish-”armored fish”d fish”410 mya410 mya 11stst amphibians amphibians invade landinvade land440 mya440 mya 11stst squid squid400 mya400 mya 11stst sharks & sharks & Small reptilesSmall reptiles


T - J - CT - J - C

Dinosaurs Dinosaurs DominateDominate

Flowering Flowering Plants Plants evolveevolve


64 mya64 myaMammals, Mammals, Birds and Birds and insectsinsects started to started to “radiate” “radiate” and fill and fill niches:niches:

1 mya1 mya 1 1stst hominidshominids

200,000 200,000 yaya 1 1stst humanshumans

DirectionsDirections►For each ERA, create drawings that For each ERA, create drawings that

represent the animals featured during represent the animals featured during that time.that time.

►Take your time to draw out animals, Take your time to draw out animals, plants or bacteria.plants or bacteria.

►Use the book (pages 427 – 440) for Use the book (pages 427 – 440) for samples of pictures.samples of pictures.

VocabularyVocabularyExtinctExtinct- When a species dies out.- When a species dies out.

PaleontologistPaleontologist- scientists that - scientists that study fossils.study fossils.

►FossilFossil- the - the preserved or preserved or mineralized mineralized remains or remains or imprint of an imprint of an organism that organism that lived long agolived long ago

How do fossils form?How do fossils form?►1. Death1. Death

2. Decay and burial2. Decay and burial

3. Sediment accumulation 3. Sediment accumulation and mineralizationand mineralization

4. Uplift and exposure4. Uplift and exposure

5. Discovery and extraction5. Discovery and extraction

Fossil samplesFossil samples

Relative Relative dating: dating: ►determining the determining the

age of a fossil by age of a fossil by comparing its comparing its placement with placement with that of fossils in that of fossils in other layers of other layers of rock.rock.

•Top layers are younger than bottom layers this also applies to the fossils found within that layer

Half-life radioactive datingHalf-life radioactive datingSome of the elements found in rocks are Some of the elements found in rocks are

radioactive.radioactive.Radioactive elements decay at a steady Radioactive elements decay at a steady

rate.rate.

A A half life half life is the time required for half of the is the time required for half of the radioactive atoms in a sample to decay. radioactive atoms in a sample to decay.

Age of a sample can be calculated based on Age of a sample can be calculated based on the remaining atoms.the remaining atoms.

Fossil RecordFossil Record- Provides evidence about - Provides evidence about the history of life on earth. the history of life on earth.

history of life on earth evolutionary timeline ms. herrera

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