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Periods of the Mesozoic
Triassic
Jurassic
13.3 Mesozoic Era:
Cretaceous
Age of Reptiles
Triassic Period
Gymnosperms
Pangaea began to break apart.
A group of plants with seeds that lack a
protective outer coat.
First mammals evolved from a surviving
group of mammal-like reptiles.
Mammals are warm-blooded and
nourish their young with milk.
Unlike spore-bearing plants, gymnosperms
do not require standing water in their
reproductive cycle.
Gymnosperms became common
Gymnosperms
Jurassic Period
Pangaea continues to break apart
Dinosaurs evolved
Dinosaurs are reptiles
Some dinosaurs were plant eaters
Some dinosaurs were meat eaters
In the oceans, fish evolved with modern
characteristics
Flying reptiles evolved
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Cretaceous Period
Produce flowers and seeds with covers
Life flourished. Including:
Cretaceous Period
Produce flowers and seeds with covers
Dinosaurs
Birds
Flowering plants (angiosperms)
Small mammals
Body hair and more efficient heart
and lungs allowed mammals to lead
more active lives than reptiles.
Cretaceous Extinction
Assignment
Large meteorite collided with Earth
Blocked out the sun
Txtbk p. 389 #3, 6, 14
Without sunlight, plants die
Without plants, plant eating
dinosaurs die
Without plant eating dinosaurs,
meat eating dinosaurs die
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