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Mr. Drake- Earth history
chapter 15
39
Geology
10th Grade
04/23/2007

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Term
Cenozoic, mesozoic, paleozoic
Definition
what are the three major eras?
Term
recent life, began 65 million years ago
Definition
Cenozoic
Term
Waht are the two periods of cenozoic?
Definition
Quaternary
Tertiary
Term
What happened during tertiary period-
Definition
flowering palts, apes elephants appear, primative horses
ALantic ocean widens
ALps and Himalaya form
India collides with asia
Term
Quaternary period
Definition
Humans became dominant, ice age
Term
mesozoic
Definition
intermediate life, began 225 million years ago and laster 160 million years.
Term
paleozoic
Definition
ancient life began 570 million years ago and laster 345 million years
Term
precambrian time
Definition
7/8 of earths hisotry- not much is known about this era includes paleozoic
Term
periods
Definition
the times of extinction are used to divide geologic history into .
Term
4.5 billion years
Definition
when did the earth come into being?
Term
3.6 billion years ago
Definition
when did living things fluorish?
Term
paleozoic era
Definition
-rise of reptiles, large insects
-large nonflowering plants in enormous swamps, amphibians, sharks
-first land plants, large coral reefs
-marine invertebrates with shells
Term
invertebrates
Definition
creatures without inter skeletons but with external shells
Term
intense tectonic activity.
Definition
how did paleozoic era end?
Term
ancient swamp
Definition
what does bed of coal imply?
Term
paleozoic rocks
Definition
where is coal plentiful?
Term
50% cenozoic
25% mesozoic and the rest in paleozoic
Definition
what % of coal was formed in each era?
Term
225 million years ago
Definition
earliest mesozoic sediments laid down
Term
Pangaea split into laurasia and gondwana
Definition
What happened to contients during mesozoic period?
Term
dinosaurs and small mammals towards the end of the era
Definition
What animals were prominent in mesozoic era?
Term
a mass extinction
Definition
What divides mesozoic from cenozoic era?
Term
almost continual in contrast with other periods
Definition
has cenozoic era have tectonic disturbances
Term
Himalays of asia
Alps of Europe
folding and uplifting of rocks
Definition
What mountain ranges were formed in the Tertiary in the mesozoic era?
HOw?
Term
Great ice age
Definition
wahted happened during pleistocene?
Term
precamberian, paleozoic, mesozoic, and cenozoic era.
Definition
Arrange the geological time in order
Term
of the same kinds as those of the present time
Definition
Ancient geological processes reval in precambrian strata were...
Term
pleozoic
Definition
coal desposits were formed during
Term
mesozoic era
Definition
laurasia and gondwana broke up in the
Term
there were several glacial advances and retreats
Definition
during the ice age
Term
super position
Definition
undisturbed sedimentary rock is older the lower you get
Term
cross cutting principle
Definition
igneous magma that cuts through strta. igneous rock is always younger
Term
relative dating
Definition
comparring the age of something to the age of another thing
Term
absolute dating
Definition
exact age of something (number)
Term
deposition
Definition
gets rocks into layers
Term
law of horizantallity
Definition
rocks (sedimentary) will be layed down horizontally if no faults/folding
Term
unconformity
Definition
any erosion surface creates it...
anyrock layer on top does not .....
Term
potassium 40, rubidium
Definition
What radionuclides are used to date rocks?
Term
principle of uniformitarian
Definition
instead of one catastrophic event, many shaped the earth to what it is today
Term
principle of uniformitarian
Definition
instead of one catastrophic event, many shaped the earth to what it is today
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