Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history...

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Physical Geology Chapter 9 Geologic Time

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Transcript of Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history...

Page 1: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Physical Geology

Chapter 9

Geologic Time

Page 2: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Geologic Column

• Represents a timeline of earth’s history

• Combined observations from many places, many people

• Ordered arrangement of rock layers

• Oldest rocks at the bottom

• Comparative dating made possible

• Best form is the Geologic Time Scale

Page 3: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.
Page 4: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.
Page 5: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.
Page 6: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Eons

• Hadean (precambrian)

• Archean (precambrian)

• Proterozoic (precambrian)

• Phanerozoic (divided into eras)

Page 7: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Eras

• Subdivisions of eons

• Phanerozoic Eon– Paleozoic – simplest marine/terrestrial life

forms– Mesozoic – early birds and reptiles– Cenozoic – mammals to man

Page 8: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Periods

• Subdivisions of Eras

• Characterized by index fossils and named for where first discovered

• Divided into epochs by more complete and detailed fossil record

Page 9: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Epochs

• Most specific of index fossils

• Divided into ages of dominant life forms with distinct individual fossils

• History is a record of past events whether found in books or in solid rock!

• Rock record indicates environments, too

Page 10: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

Evolution

• Change (scientifically, in forms of living things)

• Change has occurred; mechanisms of change highly debated

• Current scientific explanation is the theory of evolution by natural selection (Darwin)

Page 11: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.
Page 12: Physical Geology Chapter 9 Geologic Time. Geologic Column Represents a timeline of earth’s history Combined observations from many places, many people.

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