Morrison Formation of western North America was the habitat of
apatosaurus.
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Allosaurus fossils have been found in the Morrison Formation of
western North America, the Lourinhã Formation of Portugal, and the
Tendaguru Formation of Tanzania. Their fossils date to between 155
and 150 million years ago.
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Brachiosaurs were not born, they hatched from eggs. They type
species was foinf in the Morrison Formation of Colorado, which is
Late Jurassic in age..