These links are mostly for Linn, to satisfy the inner archeologist: Dead Sea asphalt deposits are famous. And might have been migratory to a point.

http://www.degruyter.com/view/j/revce.1993.9.3-4/revce.1993.9.3-4.365/revce.1993.9.3-4.365.xml

I can't say that Dead Sea asphalt or tar-like products moved that far, but it is also not a good idea to dismiss materials travelling such a distance. Time seems to reveal a lot of things we today think couldn't/wouldn't happen centuries ago that were regular occurrences.

SRS