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Flashcards in test 1 eras Deck (23):
1

precambrian era

hadean, archael, proterozoic

2

hadean eon

4500 mya, origin of the Earth

3

Archean Eon

3800 mya, oldest fossils known, porkayotes-stromatolites

4

Proterozoic

2500 mya, O2 accumulated

5

oldest eukarotes

1500 mya (precambrian)

6

first animals

700 mya(precambrian)

7

Paleozoic Era

544-245 mya

8

Cambrian

origin of most animal phyla-cambrian explosion

9

ordovician

origin of plants-marine algae..mass extinction at the end

10

sulurian

colonization of land by plants and insects

11

dovonian

raditation of bony fishes,amphibians, gymnosperms..mass extinction at the end

12

carboniderous

many forests of plants, amphibian radiation, first reptiles

13

permian

radiation of reptiles, first mammal like reptiles, modern insect orders, mass extinction of aquati and terresterial orgaisms, pangea colalesced

14

mesozoic

245-65 mya

15

triassic

245-206..first dinos, birds, gymnosperms dominant..mass extinction at the end

16

jurrasic

206-144, bony fish, dinos, first mammals

17

Cretaceous

144-65 mya, Laurasia and Gondwana separate, angiosperms appear, mass extinction at the end, modern continents by the end

18

cenozoic

65 to present

19

tertiary

65-1.8 mya, modern mammal orders, apes mid way.. ape like ancestors 5-7 mya

20

quaternary

1.8 - present, consists of pleistocene and holocene(recent)

21

pleistocene

modern ice ages, modern humans

22

holocene

(plasticene, recent), historic time, mass extinction

23

mnemonic device

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