From the thread that keeps on giving.
Let me reiterate the things I feel confident about and the things I don't ...
CONFIDENT
1) There was a global flood ~4750 ya
2) This flood buried huge amounts of organic material
3) Pennsylvanian coal has avg. 0.24pMC C14 concentration which implies that it is <50,000 yo. This C14 cannot be explained by "in situ" decay. Since this coal is supposedly 300myo, this is a major problem for the Deep Time view.
SOMEWHAT CONFIDENT
1) Modern UB has ~5600kg of C14
2) Modern total inventory C14 is ~44,000kg
3) Modern C14 production rate ~10.2kg/yr
4) Our knowledge of C14 concentration over the last 3000 years
NOT SO CONFIDENT
1) Shape of Brown's curve in the Flood era
2) Our knowledge of actual C14 concentration over the last 5000 years
3) C14 production rate changes in the Flood era
4) Total C14 being in equilibrium today
So I feel good about the two endpoints on the curve ... pre-Flood C14 concentration and the modern situation. And I think I believe we have a pretty good idea about the last 3000 years (although I have some questions), but the intervening 2000 years (5000 ya - 3000 ya) is fuzzy to me still and I'm not sure Brown has pegged it. But I feel that Brown's difficulties are like "motes" in his eye, whereas the difficulties for the Deep Time view are more like "beams." (Matthew 7:3-5)