Upheaval Dome was studied rather extensively about 15 years ago and two important new pieces of information were discovered.

1) Samples of rock from the vicinity of the dome reveal a type of mineral called “shocked quartz” that is strongly indicitave of a major impact event.

2) An analysis of the rock far beneath the dome showed no deformation of the rock strata that would be expected if the dome were caused by a rising salt dome.

These two findings, one strongly supporting the hypothesis that Upheaval Dome was the result of an ancient meteor impact, and another that strongly casts doubt on the hypothesis that the dome is the result of rising salt, give me good reason to believe that Upheaval dome is indeed a scar from meteor impact that occurred tens of millions of years ago.