Transcript Chapter 9 Section 1 Review and Study Notes (1)

Chapter 9 Section 1 Review
Page 211-214
#1
Describe the major events in any
one period of geologic time.
Example: During the Devonian Period
fish dominated Earth and amphibians
first appeared.
(see page 213; the Geologic Time Scale for more)
#2
Explain why constructing geologic
columns is useful to Earth scientists.
A geologic column is useful because it shows the
relative ages of fossils and rocks. (see Figure 1 on page 211 for
example )
.
Geologic Columns
#3
List the following units of time in order of
length from shortest to longest: year,
period, era, eon, age, and epoch.
From shortest to longest:
year, age, epoch, period, era, eon
#4
When a scientist discovers a new type of
fossil, what characteristics of the rock
around the fossil would he or she
want to learn first?
The first thing a geologist would
want to learn is the age of the rock
in which the fossil was found.
#5
How would our understanding of Earth’s past
change if a scientist discovered a mammal
fossil from the Paleozoic Era?
It would change our thinking completely
because we would have to rethink the entire
evolution of animals and the conditions on
Earth all the way back to and including the
Paleozoic. That is 500 million years of
geologic history to rewrite.
Chapter 9 Section 1:
Geologic Time
1
• The geologic _____ ______ is a table that
outlines the development of _______.
– time scale
– Earth
2
• The geologic column is an ordered
arrangement of rock layers ______ on
their ____.
– based
– ages
3
• On a geologic column, the ______ _____
are on the _______.
– oldest rocks
– bottom
4
• Scientists created the first _________
__________ by determining the relative
ages of sedimentary rock in areas all over
the world.
– geologic
– column
5
• Scientists have most accurately
determined the _______ ages of rock
layers by using radiometric dating
methods.
– absolute
6
• Rock _______ that match a similar layer in
a geologic column may have formed at the
______ time.
– layers
– same
7
• _______ fossils can be used to _____
rocks.
– Index
– date
8
• Geologic time is divided into ______
______.
– four eons
9
• A _______ is a unit of geologic time into
which an era is divided.
– period
10
• A geologic _________ is usually named
for the place where its characteristic
______ were first discovered.
– period
– fossils
The End????