Yes, I'm referring to those. There are small hills to the right (in the above photo) plus a few more rises next to those - and a couple more small hills just past the creek bed.
RT states he was made to stay inside the squad car while the search was initially under way. One can see in the later pictures posted by SAR that the sandstone boulder area (which is part of the small hill system to the right) has climbers and, IIRC, dogs searching it (that's where the crevices are), but not on the first night.
So RT didn't get a chance, presumably, to do much more than point out where he lost sight of Barbara and LE took over from there. LE arrived at 5:30, not sure when SAR arrived but Nixle report says 20 searchers that first day, ending just after midnight, Friday night.
Dusk was just after 8 pm, so they searched in the dark that night. Obviously, if Barbara was conscious and in the area, and able to move, she would have seen the search and self-rescued. The temps would have gone down and presumably, if she was still alive and had been suffering from hyperthermia, she would have been feeling better by 10 pm, as temperatures went down. If it was severe hyperthermia, then perhaps not. But if she survived that afternoon, unconscious in the desert (which is the only possible explanation, IMO, for her to still be lost at 8 pm) then she was very dehydrated and ill by the time the sun came up and the heat began to rise.
Still, the searchers were back out there, early. Where could she have gone? How far could she have gotten that first day, if she was mad/confused and stalked off in some random direction?
Did the search end when LE figured out something from the couple's digital footprint?
LE behaved, up until that next Saturday anyway, as if Barbara could still be out there.
Meanwhile, they gave RT a polygraph and a couple of days after the search ended, RT got a lawyer (who is, I believe, a criminal defense attorney - can someone confirm?)