This is a really nice bit of work and it also promises to jin up numbers for other epochs. After all this tells us that there is a five day change since the Dinosaurs. We sort of knew as much, but this makes it real
It would be wonderful to establish a real physical time line using these fossils which drove reef building. We do have millions of miles of core from reefs thanks to the oil industry.
It would also be neat to get more information as well, but i actually think that dating would be good enough.