| Cambrian Period | Ordovician Period | Silurian |
|---|---|---|
|
What is the the land
The shallow seas covered much of
|
What is the time period
505-438 million years ago.
|
What is the time period
438-408
|
|
What is south of the equator
Ancient continents lie near or?
|
What is a geologic event that happened with shallow seas
Warm shallow seas cover much of the earth.
|
What is a geologic event that had happened with coral
Coral reefs began to developed.
|
|
What is a development of life that involved a "great explosion"
A great explosion of invertebrate life occurs in the sea.
|
What is a geologic event that happened with the ice cap
The Ice Cap covered what us now North Africa.
|
What is a geologic event that had happened with early continents
Early continents collided with what is now North America, forming mountains.
|
|
What is three types of invertebrate's
Invertebrate with shells, including trilobites, and mollusks.
|
What is a development of life that got the invertebrates involved
Invertebrates dominated the oceans.
|
What is something that formed on the fish
Fish with jaws.
|
|
What is the time period
544-505 million years ago
|
What is the three types of invertebrates
Early vertebrates, jaw fish.
|
What is something that appeared
Land plants developed.
|
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