history of
eµv¥eoÑ&
life
, intercalation ,
earth billion
•
: 4.55 years
•
life appeared at 3.5
bya
→
life has since been in state of fluctuation with climate change +
cataclysmic events
shaping life course
-
geological timescale
in calculated from fossils
definition calendar of events Earth 's history of
surrounding rock
•
+
age
→
a
•
subdivides time since formation of earth →
descending units of time : eons >
eras >
periods
shows how various species have
emerged developed at various times
•
+
www.f-yfnrg time
•
Earth 's history divided into eons →
divided into zt eras →
divided into a- periods
units geochrono logical units
• -
•
timescale units
geological shows names of all geochrono logical
•
→
→
displays time
chronologically from bottom up
HADEAN - ARCHEAN - PROTEROZOIC EONS
torrentz.name we re
4600 570
MY9
•
-
hadean first prokaryotes evolve
•
→
•
archean →
first unicellular organisms + First eukaryotes evolve
proterozoic first invertebrates multicellular organisms
•
→
+
photosynthesis releases 02
→
PHANEROZOIC EON
rpalraerarzror.ve una
period 1570-515
mya) Cambrian Explosion major diversification
•
Cambrian → =
→
modern animal appear
phyla
→
marine invertebrates proliferate + trilobites dominant
algae fungi evolve
→
,
+
sponges
Ordovician period 1515-435 mya ) photosynthetic terrestrial plants
•
→
→
plants produce spores for reproduction
terrestrial fungi jawless fish
→
+
Silurian period 1435 -400
mya) terrestrial arthropods vascular plants
•
→
+
→
jawed fish + ammonites in sea
, •
Devonian period 1400-345 mya ) →
first amphibians ,
insects + ferns
Carboniferous 1345-280 mya ) Firsts reptiles
•
→
•
Permian period 1280-250 mya ) →
land masses unite to form Pangea
→
first gymnosperms
→
extinction in trilobites + other marine mammals
Mesozoic era
period 1250-190 mya ) dinosaurs dominant
•
Triassic →
→
first mammals ,
crocodiles t
bony fish
Jurassic period 1190-140 mya ) breaks up into God wana Laurasia
•
Pangea
→
t
→ first lizards t evolve
→
mammals common but small
period 1140-65 mya) up of
•
Cretaceous →
break Gondwana
→ extinction of dinosaurs ammonites ( 65 )
,
mya
→
monotremes ,
marsupials + placental mammals evolve
menagerie era
first
Tertiary period 165
mya ) early hominis
•
→
→
first
grasses
→
major evolution t dispersal of modern Angiosperms
)
•
Quaternary 12 humans evolve t spread
mya
→
→
modern mammals evolve
extinction of mammals
large
→
very
coumarin explosion ,
majority of Earth 's bit lifespan evolution produced little than bacteria plankton multi celled algae
•
4 .
→
more ,
+ -
life forms of
Cambrian period origin of all
early ancestors modern animal
groups
•
→ t
in of 30mi !
changes happened range stages took
→
5-10
yrs
•
some yrs
examples lifeforms found in fossils dated back to Paleozoic including all modern animal phyla except chordates
•
→
of era .
of
major body plan established particularly with development eukaryotes
→
types
•
re a s o n s for it
that began provided fuel for evolution of complex body
•
increase in 02 700 movement structures
mya +
→
extinction opened ecological role / adaptive
'
just before
•
space
'
up
•
external , ecological factors important for creating opportunity for explosion
eµv¥eoÑ&
life
, intercalation ,
earth billion
•
: 4.55 years
•
life appeared at 3.5
bya
→
life has since been in state of fluctuation with climate change +
cataclysmic events
shaping life course
-
geological timescale
in calculated from fossils
definition calendar of events Earth 's history of
surrounding rock
•
+
age
→
a
•
subdivides time since formation of earth →
descending units of time : eons >
eras >
periods
shows how various species have
emerged developed at various times
•
+
www.f-yfnrg time
•
Earth 's history divided into eons →
divided into zt eras →
divided into a- periods
units geochrono logical units
• -
•
timescale units
geological shows names of all geochrono logical
•
→
→
displays time
chronologically from bottom up
HADEAN - ARCHEAN - PROTEROZOIC EONS
torrentz.name we re
4600 570
MY9
•
-
hadean first prokaryotes evolve
•
→
•
archean →
first unicellular organisms + First eukaryotes evolve
proterozoic first invertebrates multicellular organisms
•
→
+
photosynthesis releases 02
→
PHANEROZOIC EON
rpalraerarzror.ve una
period 1570-515
mya) Cambrian Explosion major diversification
•
Cambrian → =
→
modern animal appear
phyla
→
marine invertebrates proliferate + trilobites dominant
algae fungi evolve
→
,
+
sponges
Ordovician period 1515-435 mya ) photosynthetic terrestrial plants
•
→
→
plants produce spores for reproduction
terrestrial fungi jawless fish
→
+
Silurian period 1435 -400
mya) terrestrial arthropods vascular plants
•
→
+
→
jawed fish + ammonites in sea
, •
Devonian period 1400-345 mya ) →
first amphibians ,
insects + ferns
Carboniferous 1345-280 mya ) Firsts reptiles
•
→
•
Permian period 1280-250 mya ) →
land masses unite to form Pangea
→
first gymnosperms
→
extinction in trilobites + other marine mammals
Mesozoic era
period 1250-190 mya ) dinosaurs dominant
•
Triassic →
→
first mammals ,
crocodiles t
bony fish
Jurassic period 1190-140 mya ) breaks up into God wana Laurasia
•
Pangea
→
t
→ first lizards t evolve
→
mammals common but small
period 1140-65 mya) up of
•
Cretaceous →
break Gondwana
→ extinction of dinosaurs ammonites ( 65 )
,
mya
→
monotremes ,
marsupials + placental mammals evolve
menagerie era
first
Tertiary period 165
mya ) early hominis
•
→
→
first
grasses
→
major evolution t dispersal of modern Angiosperms
)
•
Quaternary 12 humans evolve t spread
mya
→
→
modern mammals evolve
extinction of mammals
large
→
very
coumarin explosion ,
majority of Earth 's bit lifespan evolution produced little than bacteria plankton multi celled algae
•
4 .
→
more ,
+ -
life forms of
Cambrian period origin of all
early ancestors modern animal
groups
•
→ t
in of 30mi !
changes happened range stages took
→
5-10
yrs
•
some yrs
examples lifeforms found in fossils dated back to Paleozoic including all modern animal phyla except chordates
•
→
of era .
of
major body plan established particularly with development eukaryotes
→
types
•
re a s o n s for it
that began provided fuel for evolution of complex body
•
increase in 02 700 movement structures
mya +
→
extinction opened ecological role / adaptive
'
just before
•
space
'
up
•
external , ecological factors important for creating opportunity for explosion
