Ok, so I was off by a couple of zeros and they were mammals and not dinosaurs...my point is the same fate faces us from the ash. Rooftops of buildings would collapse from the shear weight of the ash, no crops would grow with ten feet or more of ash covering it, animals will die from lack of food, engines won't run and will seize up because the fine ash will either clog up the air cleaners or it will score the cylinder walls and all of this will make for a generally bad dayUm, the dinosaurs went extinct at the end of the Cretaceous, 64 million years ago, or roughly sixty three million three hundred and sixty thousand years prior to your ash layer.
That is quantifiable and not bull
http://en.wikipedia.org/wiki/Ashfall_Fossil_Beds