How do geologists calculate the amount of the parent/and daughter chemicals in the Rock at creation?
They don't presume anything about the rock 'at creation'.
They just presume the daughter was the p and suggest it decayed ?
Are you asking or telling?
If you are asking, the answer is no.
I would think that is overly simplified.
It would be.
If that's what happens.
I wouldn't be able to presume a rock over billions of years had no contamination or no changes over all that time... Or that no daughter was present at creation.
It would appear that only YECs make the assumption that this is how radiometric dates are conducted.
We don't even have a good understanding of the universe..
But we do have AN understanding.
And, you have to admit, no understanding will ever satisfy the YEC movement.
Where it actually came from.. How it is actually functioning.. We don't actually know space has an ability to be curved.. atmospheric refraction can explain light traveling around a planet, or intrinsic properties can explain star light..
Mmm, ... I think you may want to speak for yourself on this.
But sure, we don't know everything, especially if you go far enough back in time. But we do know some things and we can only move forward by building on what we know.