You realize that the geologic column doesn't prove any dates right? Not only that the dates can be off by much more that what you say. You simply assume that it's possible it's close, but when dealing with percentages it can be way off. This is why they reject many dates since it doesn't fit their "geologic column" area so they reject it, until a test matches. They don't even know how many daughter particles existed from the start compared to the parent particles.. There are too much details to even explain how many errors exists in their dating methods. What about contamination, you cannot prove that contamination hasn't happened, which sped up or slowed the process. It's having a candle outside burning and you have to determine when it was lit. All you can do is determine it's burning rate per hour from the day you see it until you stop your measurement. You cannot prove when it was lit because in the past the burn rate could have slowed, been turned off or almost, and you don't even know the height of the candle to begin with. Same for the parent and daughter particles.
Also, PRIOR to the flood there was a very different atmosphere (ex: Carbon/oxygen levels) and so dating things will also be affected greatly. Same for after the flood which created an ice-age which the earth is still recovering from.
The geologic column is a circular reasoning. This is one of the most widely used examples of circular reasoning. When you do a little research on the dating of 'fossils' using tests, you will find out that 'blind' studies are very rarely done and when they are, the results do not support the supposed ages of the fossils. Another problem is that the geologic column DOES NOT exist anywhere in the world. Just as an example, there are 600 MILLION years MISSING from the layers in the Palo Dura Canyon. That's a huge amount of time that is just unaccounted for. Where was this part of Texas during those 600 million years? Conclusion...there is NO 'geologic column' so how can that be used to show age or sequence of anything