+
Homework
Geologic Time Vocab Words
– be
ready to show tomorrow
Notebook
quiz tomorrow
Project or test on Monday 2/29
+
Learning Targets
I
can define the three major eras
of time and explain the main
events of each time period
+
Oxygen Lab
What
Is
did we learn?
the air 100% oxygen?
What
Why
percentage is it?
did your data not match this
number perfectly?
+
Oxygen Lab
Nitrogen is the other major
component of air (78.1%).
What
property of nitrogen have
you discovered as a result of this
experiment?
Is
it combustible?
Guiding Question:
What percentage of the Earth’s atmosphere is oxygen?
Our Claim:
Evidence:
Justification of the Evidence:
+ Precambrian Time – Check for
Understanding
Place the facts in each box in the correct order.
Earth’s Crust cools
Sun forms
Eukaryotes (cells with a
nucleus)
Oldest known rock
Left over material from our
sun collides to form the
planets
Cyanobacteria
(photosynthetic)
Earth was entirely molten
Bacteria or prokaryotes (cells
without a nucleus)
Atmosphere & oceans form
Multicellular life (examples:
sponges)
+
Precambrian Time (Answers)
1.
Sun forms
1.
Oldest known rock
2.
Left over material from our
sun collides to form the
planets
2.
Bacteria or prokaryotes
(cells without a nucleus)
3.
Cyanobacteria
(photosynthetic)
4.
Eukaryotes (cells with a
nucleus)
5.
Multicellular life (examples:
sponges)
3.
Earth was entirely molten
4.
Earth’s Crust cools
5.
Atmosphere & oceans form
+ Paleozoic
 543
Era
MYA to 248 MYA
 Means “Ancient
 Life
Life”
starts in the seas and moves on to land
 Divided
into 6 periods
 Cambrian
 Ordovician
 Silurian
 Devonian
 Carboniferous
 Permian
Cambrian Period
(570-500 MYA)
Explosion – Most major animal phyla are found
in the fossil record (mostly aquatic invertebrates with
exoskeletons).
 Cambrian
 Burgess
Rockies
Shale – major fossil site located in Canadian
+ Life starts in the seas
 Fossils
of sponges,
corals, clams, squids,
trilobites
 First
backboned
(vertebrates) appear
 Jawless
 During
fish
Silurian Period
1st jawed fish
appeared – evolved
into sharks
+
Move to land started during the
Silurian Period
 Possible
because of
formation of ozone layer
 1st
land plants (mosses
and ferns) followed by
animals (invertebrates
like spiders and
scorpions)
 All
major plant groups
except flowering plants
 Towards
the end of the
era reptiles and winged
insects appear
+
The End of the Era
Reptiles
dominate.
Pangaea begins to
form (dry climate)
One of the largest
mass extinctions
occurs
90% of all marine
invertebrates go
extinct & 70% of
all land species go
extinct
+ View of Earth—Devonian Period
+ View of Earth—Carboniferous Pd
+
View of Earth—Permian Period
+
Stop and Summarize
On page 72 in ISN…
Draw a line across middle of page
Label top half – Precambrian Time
bottom half – Paleozoic Era
Summarize in three sentences or less
each time period. Then draw an
illustration of the period.
+
Homework
Project
or test on Monday 2/29
+
Learning Targets
I
can explain the main events of
the Mesozoic and Cenozoic Eras.
+
Notebook Quiz
Take
out flashcards to be
checked
After
completing the quiz, turn it
in up front
Finish
up your summaries on
page 72
+Paleozoic Era
A.
Jawless fish (ex. Lamprey)
B.
Ocean invertebrates made of
soft tissue (ex. Jellyfish)
C.
Bony fish (ex. Salmon &
Flounder)
D.
Ocean invertebrates made of
an exoskelton (ex. Trilobite)
E.
Jawed fish (ex. Shark)
A.
Invertebrate on land (ex. Insects
& Scorpions)
B.
Greatest Mass Extinction
C.
Land Plants
D.
Reptiles
E.
Amphibians
F.
Ozone layer
Paleozoic Era (Answers)
1.
2.
3.
Ocean invertebrates
made of soft tissue
(ex. Jellyfish)
Ocean invertebrates
made of an
exoskelton (ex.
Trilobite)
Jawless fish (ex.
Lamprey)
4.
Jawed fish (ex. Shark)
5.
Bony fish (ex. Salmon
& Flounder)
1.
Ozone layer
2.
Land Plants
3.
Invertebrate on land (ex.
Insects & Scorpions)
4.
Amphibians
5.
Reptiles
6.
Greatest Mass Extinction
+
MESOZOIC ERA
(248 million years ago – 65 million years ago)
“Middle Life”
Known as the Age of Dinosaurs
Divided into 3 periods
Triassic
Jurassic
Cretaceous
+
Life in the Mesozoic
DINOSAURS
roamed for 150 million
years of the Mesozoic Era
The
1st dinosaurs were small in size
Giant
marine lizards ruled the ocean
Eoraptor:
Length:3 feet
Height: 1 foot
Weight:20
pounds
+
Life in the Mesozoic
Conifers and Flowering Plants (Gymnosperms)
+
First Mammals and Birds
1st mammals were small rodents
1st birds (Archaeopteryx)
• Jaws and bone structure like
dinosaurs
• Bones are hollow, like birds
• Had feathers
+
The End of the Mesozoic
Mass Extinction of
the Dinosaurs:
At
the end of the
Mesozoic Era there
was a mass extinction
Dinosaurs went
extinct
Many other plants
and animals
+ How could a meteorite impact
cause a mass extinction?
 The
impact caused shock waves, tidal waves,
and sent a tremendous amount of dust into the
atmosphere
 As
the dust re-entered the Earth’s atmosphere,
it would have instantly heated the atmosphere
causing tremendous forest fires
 Dust
from impact blocked out the sun and
caused major climate change and plants to die
 Plants, animals, etc. went
extinct due to the
climate changes and competition between
organisms
+
CENOZOIC ERA
(65 million years ago – Today)
“Recent life”
Known at the
“Age of the Mammals”
Divided into 2 Periods
 Tertiary
 Quaternary
We know more about this era than any other
 Why?
+
** The fossils from the Cenozoic Era
are formed recently in geologic time
so they are found in rock layers closer
to the Earth’s surface **
+

Life in the Cenozoic Era
Mammals Dominate
Early mammals were
small ground-dwelling

Later in the era there
were larger mammals

Earliest
prehistoric
humans (4 MYA)
+
Life in the Cenozoic Era
Birds, insects, and
flowering plants
(angiosperms)
Grasses
develop
allowing grazing
animals to grow even
larger
+
Climate in the Cenozoic
Climate
has changed
several times during
this era
Ice
ages covered the
Earth with sheets of
ice causing
migrations to the
equator and
extinctions of
organisms
The Great
Ice Age
+
Stop and Summarize
On page 75 in ISN…
Draw a line down the middle of the bottom
of the page
Label left half – Mesozoic Era
right half – Cenozoic Era
Summarize in three sentences or less each
time period. Then draw an illustration of the
period.