These two photos from the Denver Museum of Nature and Science Digital Archives includes these two photos from a June 1949 trip though Southeastern Utah, specifically the Glen Canyon area. It’s unclear who these folks were or whether this was an official survey party or just an jeep adventure.
CREDIT: Denver Museum of Nature and Science; https://dmns.lunaimaging.com/luna/servlet/detail/DMNSDMS~4~4~161797~112775:Glen-Canyon-scenery?qvq=q:jeep&mi=10&trs=13
CREDIT: Denver Museum of Nature and Science; https://dmns.lunaimaging.com/luna/servlet/detail/DMNSDMS~4~4~161798~112809