I figured; thanks for the info BTW.
I'm not a geologist, obviously... though there is something you said that casts doubt on dating methods: "(erosion and redeposition of fossil material into sediments of a younger age), infiltration into older or younger material"; if it is the case that the parent or daughter material can move in or out of their environment, then that means that dating via radioactive decay is compromised.
This is why radiometric dating may need to be performed on both the found object and the matrix in which it is found. For example, my house was built in 1960, if I open a dresser drawer and find a coin dating from 1905, does that mean that my house is older than I thought or that the date on the coin is wrong?