Aim: How do Geologist break-up Geologic Time? Do Now: - Take out your ESRT and turn to page 8-9 - Earth has existed for 4.7 billion years. If this 4.7 billion years were to be scaled down to a 12 hour clock, then how much time on that clock do you think Humans have existed? - 12:00:00 AM would be the creation of Earth (4.6BYA) - 12:00:00 PM would be this very second (Present)
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Aim: How do Geologist break-up Geologic Time? Do Now: - Take out your ESRT and turn to page 8-9 - Earth has existed for 4.7 billion years. If this 4.7.
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Aim: How do Geologist break-up Geologic Time?
Do Now: - Take out your ESRT and turn to page 8-9
- Earth has existed for 4.7 billion years. If this 4.7 billion years were to be scaled down to a 12 hour clock, then how much time on that clock do you think Humans have existed?
- 12:00:00 AM would be the creation of Earth (4.6BYA)
- 12:00:00 PM would be this very second (Present)
I. Counting Geologic Time
- Eons are the longest periods of time (billions of years)
- Eras break up Eons (100 million years)
- Periods break up Era’s (10 million years)
- Epochs break up Periods (million years)
In what time Eon, Era, Period and Epoch do we live?
Phanerozoic eon, Cenozoic era, Quaternary period and the Holocene epoch.
II. Fossils
- the remains or traces of prehistoric life. - found only in sedimentary rock.
• Trace fossils are indirect evidence of prehistoric life.
- foot print- burrow
III. Fossil FormationTwo conditions are important
for preservation: • rapid burial • hard parts - teeth - bone