Originally Posted by Dylan

Actually, a change in atmospheric composition would be indicated by the petrified trees, erosion patterns, and sediment layers. I am not assuming that erosion and decomposition took place at the same rate. It all depends on the environment. Radioactive dating doesn't though. Decay rates are pretty steady. That's what is used for the actual time measurement. The evidence is dated, and then analyzed.

Seriously dude, you have no idea what you are talking about. I think you should go talk to someone at the science department of your local college. He or she might be able to straighten out your misinformation about how the past is pieced together from evidence.