Transcript Chapter 5: Fossils and Geologic Time

Chapter 5: Fossils and Geologic
Time
Topic 3: Fossils
For Further Study..
• Fossil groups
• Fossil Song
• Trilobites
DRA item #1
The remains or physical evidence of an organism preserved by
fossil
geologic processes is called a ______________________.
These are most often preserved in
sedimentary
_________________________
rock but may also be found
preserved in _________________________
,
amber
________________________,
or ______________.
asphalt
ice
Fossilization in Rock
Trace Fossils: Casts and Molds
DRA item #2
Petrifaction
_____________________________
is a process in
which minerals replace an organism’s tissues. A
good example of this is
petrified
_________________________
wood.
Petrified Wood
Petrified Dragonfly
DRA item #3
Amber
_________________________
is hardened tree sap and can
preserve all parts (hard and soft) of small insects.
____________________
forms thick, sticky pools that
Asphalt
have trapped and preserved organisms that have lived in
Ice
more recent times. ____________________
contains
almost no decomposing bacteria and can preserve
organisms almost perfectly for tens of thousands of years.
Fossil in Amber
DRA item #4
The fossil record reveals a history of
environmental
________________________
change.
___________________
fossils help reconstruct
Marine
ancient coastlines and the uplift of mountains. Fossils
of plants and animals can help in the reconstructing of
past ______________________.
climates
DRA item #5
By studying the relationships between fossils found in
different parts of the geologic column, scientists
can interpret how ________________
has changed
life
over time. Finally, using fossils of organisms that
only existed for a short span of identified time,
they can determine the absolute age of rock that
they are found in without relying on radiometric
dating methods. These types of fossils are known
as ____________________________
and include
index fossils
such fossils as ________________
and
ammonites
____________________________.
trilobites (State fossil)
Ammonite fossils
Trilobite fossils
Dunkleosteus fossil
Dunkleosteus reconstructions
33 feet long!
Geologic Time videos
•
•
•
•
animated song
Mr.Parr song
Mr.Parr music video
Earth history in a year's time