Answer:
The basic setting in which the story takes place is a jungle in which a safari is being conducted. The characters are on a type of safari- like hunt for a Tyrannosaurus Rex.It is in the past with people from the future in which Bradbury is able to construct his story, establishing the setting for it.
I see it as difference between two of my 2 favourite contemporary works
Harry Potter - magical realism - takes place in our 'real' world with, I must say, substantial addition of 'magical' to it, but still, seen as normal by those involved
Lord of the rings - fantasy - whole different world.
I hope I explained it well..
Go Allen!! Burn those flags!