Timeline, police radio traffic:
http://www.cbs8.com/story/25971456/timeline-emerges-in-marine-wifes-mysterious-disappearance
This link says that Erin's car was found "just a couple miles from the Marine base but more than 8 miles from the Joshua Tree park entrance".
Isn't that strange wording if Joshua Tree park is an hour drive from the base? Or am I missing something?
http://www.cbs8.com/story/25971456/timeline-emerges-in-marine-wifes-mysterious-disappearance