Geologic Time Scale NB #41. Time Periods O Eons O Eras O Periods O Epochs.
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Geologic Time Scale NB #41
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Transcript of Geologic Time Scale NB #41. Time Periods O Eons O Eras O Periods O Epochs.
Geologic Time ScaleNB #41
Time PeriodsO EonsO ErasO PeriodsO Epochs
Precambrian EraO Time Period: 4.54 billion to 544 million
years agoO Earth formed from planetary nebulaO Organisms:
O First cells ( 3.9 bya)O Blue-green algae & stromatolites (3.6 bya)O Oldest fossilized bacteria (3.25 bya)O Oldest fossilized cells w/ nucleus (2.1 bya)O First multi-celled organisms (1.5 bya)O First marine worms & jellyfish (670 mya)
Precambrian Era
Paleozoic EraCambrian Period
O Time Period: begins 544 million years ago
O Organisms:O Burgess ShaleO First animals with hard parts (trilobites)
Paleozoic EraOrdovician Period
O Time Period: began 505 million years ago
O Organisms:O First fishO First fossil evidence of land plants
Paleozoic EraSilurian Period
O Time Period: Began 438 million years ago
O Organisms:O First vascular land plantsO Oldest lung fish fossils
Paleozoic EraDevonian Period
O Time Period: Began 408 million years agoO Organisms:
O Oldest fossil evidence of mosses (408 mya)O First insects (beetles), scorpions, and
centipedes (385 mya)O First lobe-finned fish (380 mya)O First land animals (amphibians) (375 mya)O First sharks (370 mya)O First seed plants (ferns) (365 mya)
Paleozoic EraDevonian Period
Coelacanth
Finding the coelacanth
Paleozoic EraMississippian Period
O Time Period : Began 360 million years ago
O Organisms: O First possible reptiles (330 mya)
Paleozoic EraPennsylvanian Period
O Time Period: Began 320 million years ago
O Kentucky coal
Paleozoic EraPermian Period
O Time Period: Began 286 million years ago
O Organisms:O Sail-backed reptilesO End of Paleozoic– 96% of all life on
Earth perishes
Mesozoic EraTriassic Period
O Time Period: Began 245 million years ago
O Organisms:O First crocodiles (240 mya)O First dinosaurs (228 mya)
O Eoraptor and SaltoposuchusO First mammals (shrew-like) (221 mya)O First turtles (210 mya)
Mesozoic EraJurassic Period
O Time Period: Began 208 million years agoO Organisms:
O Dilophosaurus (195 mya)O First bird- Archeopteryx (155 mya)O Apatosaurus and Brachiosaurus (152 mya)O Allosaurus (carnivore) (150 mya)O Stegosaurus (plate-backed dinosaur) (148
mya)
Mesozoic EraJurassic Period
Mesozoic EraCretaceous Period
O Time Period: Began 144 million years agoO Organisms:
O First flowering plant (115 mya)O Duck-billed dinosaurs (82 mya)O Protoceratops (first dinosaur eggs
discovered) (80 mya)O Triceratops (75 mya)O Tyrannosaurus rex & Velociraptor (70 mya)
O Ended Mesozoic with meteorite
End of Mesozoic Era
Cenozoic EraTertiary Period
O Time Period: Began 65 million years agoO Organisms:
O First ancestors of dogs & cats (64 mya)O Grasses become widespread (60 mya)O First ancestors of pigs & deer (57 mya)O First horses (Eohippus) (55 mya)O First ancestors of rabbits (45 mya)O First monkeys (39 mya)O Oldest human like ancestors (hominids)
(4 mya)
Cenozoic EraQuaternary Period
O Time Period: Began 2 million years ago
O 1st of 4 ice ages (1 mya)O Organisms:
O Oldest direct human-ancestor fossilO Homo habilis (1 mya)
O First modern man, Homo sapiens (0.1 mya)
O Mammoth & mastodon bones (0.05 mya)
