Fossils and Earth

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Fossils and Earths Geologic History
PRESENTED BY MARK A. VAN HECKE ANCHOR BAY HIGH
SCHOOL NEW BALTIMORE, MI
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ALL GEOLOGIC TIME IS DIVIDED INTO TWO EONS

• PHANEROZOIC FROM 570 MILLION YEARS AGO TO THE
  PRESENT
• PRECAMBRIAN EON FROM 3.4 BILLION YEARS AGO TO 570
  MILLION YEARS AGO

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EACH EON IS DIVIDED INTO PERIODS

• ONLY THE PHANEROZOIC IS DIVIDED INTO PERIODS,
• THE THREE YOU NEED TO KNOW ARE
• PALEOZOIC
• MESOZOIC
• CENOZOIC

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EACH OF THE ERAS IN TURN IS DIVIDED INTO PERIODS
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PALEOZOIC ERA

• CAMBRIAN
• ORDOVICIAN
• SILURIAN
• DEVONIAN
• MISSISSIPIAN
• PERMIAN

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MESOZOIC ERA

• TRIASSIC
• JURASSIC
• CRETACEOUS

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CENOZOIC ERA

• TERTIARY
• QUATERNARY

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PERIODS IN TURN ARE DIVIDED INTO EPOCHS
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THE PERIODS OF THE PALEOZOIC AND MESOZOIC ARE
SIMPLY DIVIDED INTO EARLY, MIDDLE AND LATE EPOCHS
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EPOCHS OF THE CENOZOIC ERA ARE GIVEN DISTINCTIVE
NAMES IN EACH OF THE PERIODS
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TERTIARY PERIOD

• PALEOCENE
• EOCENE
• OLIGOCENE
• MIOCENE
• PLIOCENE

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QUATERNARY PERIOD

• PLEISTOCENE
• HOLOCENE (PRESENT)

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MOST GEOLOGISTS THINK THAT THROUGHOUT ITS
HISTORY EARTHS CLIMATE HAS SEE-SAWED BETWEEN A
HOT HOUSE AND AN ICE BOX CLIMATE
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PreCambrian Eon570 million-3.4 billion years ago
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PALEOZOIC ERA 570 MILLION YEARS AGO- 225 MILLION
YEARS AGO
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CAMBRIAN PERIOD 570-500 MILLION YEARS AGO
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ORDOVICIAN PERIOD 430-500 MILLION YEARS AGO
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SILURIAN PERIOD 395-430 MILLION YEARS AGO
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DEVONIAN PERIOD 345-395 MILLION YEARS AGO
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THE MISSISSIPPIAN 325-345 MILLION YEARS
AGO AND PENNSYLVANIAN PERIODS 280-325 MILLION
YEARS AGO MAY BE GROUPED TOGETHER
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AS THE CARBONIFEROUS PERIOD
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PERMIAN PERIOD 225-280 MILLION YEARS AGO
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MESOZOIC ERA
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TRIASSIC PERIOD 190-225 MILLION YEARS AGO
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JURASSIC PERIOD 136-190 MILLION YEARS AGO
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CRETACEOUS PERIOD 65-136 MILLION YEARS AGO
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CENOZOIC ERA
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TERTIARY PERIOD
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PALEOCENE EPOCH 54-65 MILLION YEARS AGO
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EOCENE EPOCH 37.5-54 MILLION YEARS AGO
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OLIGOCENE EPOCH 26 37.5 MILLION
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MIOCENE EPOCH 5-26 MILLION YEARS AGO
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QUATERNARY PERIOD
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PLEISTOCENE EPOCH 11,000-1.8 MILLION YEARS AGO
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HOLOCENE EPOCH 11,000 YEARS AGO-PRESENT
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