Geological Time

The geological time scale was developed to represent

• The revolutionary history of Earth

• The revolutionary history of Fossils

• The revolutionary history of Rocks

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Law of Superposition states

• Younger rocks are on bottom, Older rocks are on top

• Oder rocks are on bottom, Younger rocks are on top

• Rocks are spread out evenly

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The Earth is how old

• 3.5 Billion years old

• 3.6 Billion years old

• 4.5 Billion years old

• 4.6 Billion years old

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Principle of original horizontality

• States that sedimentary rocks are originally laid down in vertical layers

• States that sedimentary rocks are originally laid down in horizontal layers

• states that sedimentary rocks are originally laid down in diagonal layers

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Label the Geologic Time Scale in order from oldest to most recent

a

b

c

d

e

f

g

4.5 billion years Formation of Earth

500 million years Plants on land

3.7 billion years Earliest signs life

4.4 billion years Arrival of Water

250 million years Permian Extinction

200,000 years Modern Humans

375 million years Animals on land

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Because the time span of Earth's past is so great, geologists use the ​ (a)   to show Earth's history.

• geologic time scale

• graphical time span

• geological time frame

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What was the "Age of Reptiles"

• Ice Age

• Mesozoic Era

• Precambrian Era

• Precambrian Eon

Rocks that are pressed under water for many years

• Igneous

• Sedimentary

• Metamorphic

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NGSS.MS-ESS1-4

What helps geologists match rock layers, and determine the relative ages of the rocks.

• Index fossils

• fossil fuels

• Index rocks

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Which fossil is the youngest?

• fossil A

• fossil B

• fossil C

• fossils A and B are the same age

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NGSS.MS-ESS1-4