I really like this pic. Even without the title it's time is readily apparent. Just look at the rolled up cuffs on the denims. They scream 'Fifties.
The one on the right is trying to look so cool - with a "James Dean" kind of cool insouicence. The others strike a range of poses (and these are poses - no "street" or "decisive moment" here) that demonstrate various forms of "cool" a'la the time.
One has a straight-into-the-lens engagement and smile while the others strike poses that could almost be from the Dead End Kids.
Of course there are not "real" cowboys - one look at the boots confirms we have the genuine drug store version.
I don't know where Blind River, ONT is located - I'm wondering if this was taken by Parks while on a holiday.
Yes, it's very different from his "movement" pics - but to me, that shows the range of the man's talent.
EDIT: Had to "google" it:
http://www.blindriver.com/site/welcome/