Welcome To Class

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Agenda

• Turn in homework• Geologic time scale

– Notes

• Fossil Reading 2• Review for test

Geologic Time• If time was a 30 day month• Recorded human history would be .18 minutes

or 10.8 seconds• First Homo sapiens would be .013 days or 18.72

minutes or 1123.2 seconds• Cenozoic would be .42 days or 604 minutes• Mesozoic would be 1.18 days or 1700 minutes• Paleozoic would be 1.95 days or 2808 minutes• Precambrian would 26.4 days or 38106 minutes

http://www.athro.com/geo/hgfr1.html

In a day…

• Human history = 2.5 seconds• Home sapiens = .6 minutes• Cenozoic = 20.2 minutes• Mesozoic= 56.5 minutes• Paleozoic= 93.6 minutes• Precambrian= 1269.7 minutes

Geologic Time Scale

• Geologic time scale – chart that divides Earth’s history into units of time

• Divisions based on geologic events and major changes in living things

Geologic Time Scale

Divided into eons, eras, and periods

PRECAMBRIAN TIME

Length– beginning of time (4.6 billion yrs) – 542 million years ago

Makes up 88% of Earth’s history

Precambrian Time

• Major Events– Earth forms– Rocks and minerals form– Stromatolites (algae) are most

common fossils

PALEOZOIC ERA

Paleozoic Era

• Length – 542 – 251 million years ago

• Major Events– Supercontinent, Pangea, formed– Shelled marine animals common– Land Plants and animals appear– Fish, amphibians, reptiles appear– Permian mass extinction

Paleozoic Broken Down

• Cambrian• Ordovician• Silurian• Devonian• Carboniferous

– Mississippian– Pennsylvanian

• Permian

MESOZOIC ERA

Mesozoic Era

• Length – 251-65 million years ago– Age of the Dinosaurs

• Major Events– Pangea broke up– Dinosaurs– First Birds– First flowers– Dinosaur extinction

Mesozoic Broken Down

• Periods in the Mesozoic– Triassic– Jurassic– Cretaceous

CENOZOIC ERA

Cenozoic Era

• Length – 65 million years ago-present– Age of mammals

• Major Events– Mammals appear– Continents in current places– First humans

Cenozoic Broken Down

• Tertiary– Paleocene– Eocene– Oligocene– Miocene– Piliocene

• Quaternary– Pleistocene– Holocene

Fossil Reading

• Due today

Review

• Worksheet due on test day

• Create a Note card (tomorrow)

Which are the oldest?

• Remember the laws/principles/unconformities– Law of Superposition– Principle of Original Horizontality– 3 Unconformities– Law of Cross Cutting Relationships

Absolute Age

• Radiometric/carbon dating

• Half life

Interpret a half life graph

5.8 days

.25 half lives

28 years

Review

• Work on the worksheet– Due on the TEST!!– Create a note card

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