The Stone of Erech was not brought to Middle-Earth at the time of the fall of Numenor; presumably it was brought over long before then. The Numenoreans had multiple outposts in Middle-Earth before the island's downfall (notably Osgiliath), and it was also mentioned that they had created in Middle-Earth such wonders as the Argonath, the Tower of Orthanc, and Erech.
So it wasn't a last minute "run for your lives but don't forget to grab that really big rock" thing. [img]smilies/smile.gif[/img]
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