North America was very different during the time of the dinosaurs,
sea-levels were higher, and large parts of the North American interior
were thus shallow seas, permanently underwater. The inhabitants
of these seas included
included strange marine creatures, unknown today, such as
Ammonites and
Belemnites,
as well as giant marine reptiles such as
Plesiosaurs and
Pliosaurs.
Furthermore, the position of the continents was different too:
During the early part of the
Mesozoic Era
(the
Triassic Period),
North America was joined with all the other continents in one super-continent known
as Pangaea.
By the
Jurassic Period,
Pangaea begun to break up into two smaller super-continents:
Laurasia and Gondwanaland. North America was part of the northern
super-continent, Laurasia, which also included
Europe and Asia (except for India).
However, the very beginnings of the Atlantic slowly appeared, as
North America slowly begun to break-away from Europe.
In the
Cretaceous Period,
Laurasia continued its break-up. The Atlantic eventually became
a wide ocean separating North America from Europe.
Brachiosaurus lived in North America and Africa (although some scientists argue that the African variety should be classified as a separate genus, which they call "Giraffatitan").
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