Do you have any evidence it decayed at all? Or, is this pure speculation?
So, you don't have any evidence to support your claim that carbon decayed at a different? The evidence that carbon decays at a consistent rate is that it has always decayed at the same rate since we have been looking at it. It has never changed.
That has about as much merit as saying, since I saw a car coming down the highway, cars always came and at the same speed.
That's a ludicrous comparison. Since we have been measuring the decay rate of carbon it has never changed and we have found absolutely no indication that it would ever change. It is pure speculation that at any time in history it decayed at a different rate, unless you can provide some evidence to support your claim. As of yet, you have not provided anything beyond mere speculation.
The issue is not 'history'. The issue is pre history. Science measuring rates for a few hundred years is very recent.
I agree, but throughout the time we've been measuring the decay rate, it has never changed. And, we have found no indication or reasoning to back up any claim that it would have changed at all.
You seem to assume decay existed. Evidence?
We see it happen every time we look for it. It also lines up with the chemistry.
Here is a pretty good explanation of why carbon 14 undergoes radioactive decay.
So, 1) we have direct evidence that carbon 14 undergoes radioactive decay and has decayed at the same rate since we were able to measure it, 2) we understand why carbon 14 decays at a consistent rate, and 3) there is absolutely no evidence, none whatsoever, that would even lead us to consider the possibility that carbon 14 would not have decayed millions of years ago at the same rate.