Please read post 71.
Bottom line, if you have 50 trillion cells to choose from, there is a really good chance to have good dna from a few cells, even at 1 billion years.
Plus, if you can get a cell with 3/4 of the dna intact and another cell with a different 3/4 intact, you can put the sequences together and get a decent copy.
It is like canabalizing parts from 5 old cars at the junk yard to get your old car to run.
so you really believe there should be viable soft tissue with collagen and red blood cells with liquid components after room temp for 90 million years?
Obviously you are a true believe in the idea life was formed as an accident, and global warming is real.