Summations Only

The Biblical Flood has already been disproven. Years ago. Something like 200 years ago, as a matter of fact.Why should anyone waste anymore time on this?

I would like to see a map and/or good descriptions with locations for all these devitrified ash layers and the 'over-filled' basins.

Actual dates, if the samples are collected appropriately, are not often wrong, but it does depend on what you are dating. So if you think you are age dating an igneous stock, but mistakenly collect a much later (younger), but similar looking igneous dike, you could assign an incorrect date to the stock. Eventually we figure it out because geologic field relationships often help us recognize errors.I have not read the paper, but scientists generally only date things when they feel it is important to do so. Besides, it costs money and many times we already have a good idea of the age of rocks based on stratigraphic / field relationships, age dating in nearby areas, etc.