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GEN BIO 2 > Geological Timescale > Flashcards

Geological Timescale Flashcards

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Biology 101 flashcards
1
Q

record of the life forms and geological events in Earth’s history

A

Geological time scale

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2
Q

scientists developed the time scale by studying what?

A

rock layers and fossils

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3
Q

helps determine the absolute divisions in the time scale

A

Radioactive dating

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4
Q

largest sections are called?

A

eons

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5
Q

eons are divided into?(the 2nd largest section)

A

eras

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6
Q

are divided “periods”

A

eras

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7
Q

are divided into “epochs”

A

periods

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8
Q

what are the two eons

A

Cryptozoic eon and Phanerozoic eon

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9
Q

what are the major eras?

A

archean, proterozoic,pleozoic,mesoozoic,cenozoic

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10
Q

How is time divided?

A

because a major organism went extinct in each section.

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11
Q

540-4600 mya, oldest and longest

A

cryptozoic eon

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12
Q

2500-4600 mya, earliest plants

A

archean era

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13
Q

540-2500 mya, glaciations

A

proterozoic era

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14
Q

540 mya - present, divided into three eras

A

paleozoic era, mesozoic era, cenozoic era

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15
Q

middle life

A

mesozoic era

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15
Q

past life

A

paleozoic era

16
Q

present life

A

cenozoic era

17
Q

570-250 mya, divided into 6 periods, organisms had hard parts

A

paleozoic era

18
Q

250-65 mya, time of reptiles

A

mesozoic era

19
Q

65 mya to present, development of mordern mammals

A

cenozoic era

20
Q

two periods in cenozoic ersa

A

tertiary and quarternary

21
Q

reptiles were formed

A

carboniferous period

22
Q

largest mass extinction

A

permian

23
Q

first birds and mammals were formed

A

jurassic

24
Q

beginning of cenozoic era, all dinosaurs and half of the other plants and animals went extinct

A

cretaceous

25
Q

humans evolved

A

quarternary period

26
Q

negative image of an organism, shells

A

molds

27
Q

when a mold is filled in

A

casts

28
Q

converted into stone

A

petrified

29
Q

preserved

A

original remains

30
Q

carbon impression in sedimentary rocks

A

carbon film

31
Q

record the movements and behaviors of the organism

A

trace

32
Q

small organsim trapped in amber, hardened plant sap

A

unaltered preservation

33
Q

hard parts are dissolved and replaced by other minerals, like calcite, silica, pyrite, or iron

A

Replacement

33
Q

Hard parts are converted to more stable minerals or small crystals turn into larger crystals

A

Recrystalization

34
Q

does not tell the exact age

A

relative dating

34
Q

two ways to measure the age of a fossil

A

relative dating and absolute dating

GEN BIO 2 (5 decks)

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