Slide 2 Geologic Time Scale Mr. Skirbst Earth Science Topic 25
Slide 3 Geologic Time Scale Slide 4 Describing and dividing major
events of Earths history Slide 5 Geologic Time Scale Era - longest
division of geologic time Slide 6 Geologic Time Scale Era - longest
division of geologic time 4 Major Eras Slide 7 Geologic Time Scale
Era - longest division of geologic time 4 Major Eras Period
sub-divisions of eras Slide 8 Geologic Time Scale 1.Precambrian -
early Earth Slide 9 Geologic Time Scale 1.Precambrian 2.Paleozoic
old life Slide 10 Geologic Time Scale 1.Precambrian 2.Paleozoic
3.Mesozoic middle life Slide 11 Geologic Time Scale 1.Precambrian
2.Paleozoic 3.Mesozoic 4.Cenozoic current life Slide 12 Precambrian
Era 4.6 bya 570 mya Slide 13 Precambrian Era 4.6 bya 570 mya Earth
formed Slide 14 Precambrian Era 4.6 bya 570 mya Earth formed Seas
and mountains formed Slide 15 Precambrian Era 4.6 bya 570 mya Earth
formed Seas and mountains formed Simple life-forms in sea Slide 16
Precambrian Era 4.6 bya 570 mya Earth formed Seas and mountains
formed Simple life-forms in sea Oxygen builds up in air Slide 17
Paleozoic Era 570 mya 225 mya Slide 18 Paleozoic Era 570 mya 225
mya Divided into 6 periods based on major events Slide 19 Paleozoic
Era Cambrian sea-dwelling inverts. Slide 20 Paleozoic Era Cambrian
sea-dwelling inverts. Ordovician first fish appear Slide 21
Paleozoic Era Cambrian sea-dwelling inverts. Ordovician first fish
appear Silurian first land plants Slide 22 Paleozoic Era Cambrian
sea-dwelling inverts. Ordovician first fish appear Silurian first
land plants Devonian first amphib. + forests Slide 23 Paleozoic Era
Cambrian sea-dwelling inverts. Ordovician first fish appear
Silurian first land plants Devonian first amphib. + forests
Carboniferous swamps, ferns, insects, reptiles Slide 24 Paleozoic
Era Cambrian sea-dwelling inverts. Ordovician first fish appear
Silurian first land plants Devonian first amphib. + forests
Carboniferous swamps, ferns etc Permian conifers, lots of reptiles
Slide 25 Paleozoic Era Memory aid: COSDCP Slide 26 Paleozoic Era
Memory aid: COSDCP Come Over, Said DC Pig Slide 27 Mesozoic Era 225
mya 65 mya Slide 28 Mesozoic Era 225 mya 65 mya Triassic 1 st
dinosaurs + mammals Slide 29 Mesozoic Era 225 mya 65 mya Triassic 1
st dinosaurs + mammals Jurassic 1 st birds + big dinos Slide 30
Mesozoic Era 225 mya 65 mya Triassic 1 st dinosaurs + mammals
Jurassic 1 st birds + big dinos Cretaceous 1 st flowers + dinos die
out Slide 31 Cenozoic Era 65 mya Present Tertiary mammals,
present-day features Slide 32 Cenozoic Era 65 mya Present Tertiary
mammals, present-day features Quaternary humans, ice ages
