During a 3/20/09 interview on NPR, author Sean Carroll talks about his book 'Remarkable Creatures' Behind Darwin's Discoveries.
Among the explorers and naturalists in his research he mentions Roy Chapman Andrews. A real life explorer who's matinee newsreels fascinated a young George Lucas and the rest as they say - is history
http://departments.colgate.edu/geology/museum/egg/egg3.htm (http://departments.colgate.edu/geology/museum/egg/egg3.htm)