Well it was first published in 1980. I found it and it is blue
alright with wavy lines on the cover by a certain Gregory Benford, but
the plot line looks all wrong: it's about communicating through time
using tachyons...
The one you mentioned has people's ancestors' memories encoded in RNA
which they are able-to-relive/sort-of-travel-back-in-time, right? I
thought it was pretty cheesy with a guy going back to be a seamstress
in ancient Egypt and getting laid and stuff like that. My Dad read it
too and thinks the title was "something like Timeliners". He didn't
think it was cheesy BTW.
Sorry I can't help more.
Rob.