Document

Report
Fossils
and
Earth’s Geologic History
Fossil Event Div. B&C
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
EACH EON IS DIVIDED INTO
PERIODS
ONLY THE PHANEROZOIC IS
DIVIDED INTO ERAS,
THE THREE YOU NEED TO
KNOW ARE
•PALEOZOIC
•MESOZOIC
•CENOZOIC
EACH OF THE ERAS IN
TURN IS DIVIDED INTO
PERIODS
PALEOZOIC ERA
•CAMBRIAN
•ORDOVICIAN
•SILURIAN
•DEVONIAN
•MISSISSIPIAN
•PERMIAN
MESOZOIC ERA
•TRIASSIC
•JURASSIC
•CRETACEOUS
CENOZOIC ERA
•TERTIARY
•QUATERNARY
PERIODS
IN TURN ARE
DIVIDED INTO EPOCHS
THE PERIODS OF THE
PALEOZOIC AND
MESOZOIC ARE
SIMPLY DIVIDED INTO
EARLY, MIDDLE AND
LATE EPOCHS
EPOCHS OF THE
CENOZOIC ERA ARE
GIVEN DISTINCTIVE
NAMES IN EACH OF THE
PERIODS
TERTIARY PERIOD
•PALEOCENE
•EOCENE
•OLIGOCENE
•MIOCENE
•PLIOCENE
QUATERNARY
PERIOD
•PLEISTOCENE
•HOLOCENE (PRESENT)
MOST GEOLOGISTS
THINK THAT
THROUGHOUT IT’S
HISTORY EARTH’S
CLIMATE HAS SEESAWED BETWEEN A
‘HOT HOUSE’ AND AN
‘ICE BOX’ CLIMATE
PreCambrian Eon
570 million-3.4 billion years
ago
PALEOZOIC ERA
570 MILLION YEARS
AGO225 MILLION YEARS
AGO
CAMBRIAN PERIOD
570-500 MILLION
YEARS AGO
ORDOVICIAN PERIOD
430-500 MILLION YEARS
AGO
SILURIAN PERIOD
395-430 MILLION YEARS
AGO
DEVONIAN PERIOD
345-395 MILLION YEARS
AGO
THE MISSISSIPPIAN
325-345 MILLION YEARS AGO
AND
PENNSYLVANIAN
PERIODS
280-325 MILLION YEARS AGO
MAY BE GROUPED
TOGETHER
AS
THE
CARBONIFEROUS PERIOD
PERMIAN PERIOD
225-280 MILLION
YEARS AGO
MESOZOIC ERA
TRIASSIC PERIOD
190-225 MILLION YEARS AGO
JURASSIC PERIOD
136-190 MILLION YEARS
AGO
CRETACEOUS PERIOD
65-136 MILLION YEARS
AGO
CENOZOIC ERA
TERTIARY PERIOD
PALEOCENE EPOCH
54-65 MILLION YEARS
AGO
EOCENE EPOCH
37.5-54 MILLION YEARS
AGO
OLIGOCENE EPOCH
26 –37.5 MILLION
MIOCENE EPOCH
5-26 MILLION YEARS AGO
QUATERNARY PERIOD
PLEISTOCENE EPOCH
11,000-1.8 MILLION
YEARS AGO
HOLOCENE EPOCH
11,000 YEARS AGOPRESENT

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