Imlay Canyon 

The creation of Utah's canyons has been ongoing for millions of years, the recreational exploration and these places has just began.  The first technical canyoneering routes in Zion were done in the 1960's, the last major canyoneering route (Heaps Canyon) was not completed until 1982.  There are still new canyoneering routes to be done in the Zion National Park but as time goes on the options have become more remote and less rewarding.