Chapter 5: Fossils and Geologic Time

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Chapter 5 Fossils and Geologic Time

• Topic 4 The Geologic Time Scale

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Geologic Time videos

• animated song
• Mr.Parr song
• Mr.Parr music video
• Earth history in a year's time

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Item 1
Based on the radiometric dating of rocks on Earth
and from space (moon rocks, meteorites) the Earth
is estimated to be ____________________________
years old. This span of time is known as
_________________________ time
4.6 billion
geologic
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Item 2
All of earths geologic time is divided into
distinct intervals based on major events
(changes) on Earth. These divisions are described
by the _________ ______________
Geologic time scale
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Item 3
. The largest divisions of time are called
________________. We presently live in the
______________________ eon, which began about
__________________________ years ago. This time
span is marked by an abundant supply of different
species of life on Earth. This eon is divided
into three _____________ based on major changes
to the profile of life on Earth.
eons
phanerozoic
550 million
eras
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Item 4
The boundaries between eras are marked by major
amounts of _____________________ to species. This
represents the death of every member of a
species. Many of these events are linked to
global ___________________ change or catastrophic
events such as a meteor impact.
extinction
climate
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Item 5
paleozoic
The ______________________ era is known as the
age of the fish (ancient marine life). It ended
with a mass extinction that killed nearly
__________ of all species around at the time.
Toward the end of this era, ____________________,
______________________, and ___________________
began to appear. The Appalachian mountains formed
in North America during this era.
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reptiles
amphibians
insects
Note All major land plants (non-flowering)
evolved during this era.
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All time prior to paleozoic referred to as
pre-cambrian era)
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Typical paleozoic life
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Item 6
mesozoic
The ___________________________ era is known as
the age of the reptiles (including dinosaurs).
Small mammals and __________________ appeared
toward the end of this era. The Rocky Mountains
formed in North America during this time. This
era ended with a mass extinction that killed
about ____________ of all species around at the
time.
birds
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NOTE Flowering plants and bees appeared late in
this era.
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Item 7
cenozoic
The ____________________________ era is the most
recent and the one we live in today. It is known
as the age of the _______________________ and
includes the last ice age and the formation of
the Himalaya Mountains.
mammals
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