Doesn't look like Petrified Forrest NP
The backdrop from the café/gas station doesn't look anything like the actual Petrified forest near Holbrook, AZ. The area isn't nearly as hilly, but then the film was shot entirely in California. Black Mesa is a real place and almost as hilly as the backdrop, but it's not in the thick of the Petrified Forest although there may be some petrified wood there. Black Mesa is about a hundred miles north of Petrified Forest National Park (more if you're not a crow).
Oops! Just noticed something really absurd--a saguaro cactus painted on a backdrop! There are none in Northern Arizona where the altitude just about everywhere is at least a thousand feet above their range. Saguaros disappear abruptly after you leave Black Canyon City, only fifty miles north of downtown Phoenix.
--
Drake
FYI
[spoiler][/spoiler]
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