Bones of the Earth is a knock-off of Asimov's the End of Eternity. The original is better: read that, not this.
Quite how the author of Vacuum Flowers and Stations of the Tide came to write this gumpf I do't know. There are no ideas here: the paradoxes of time travel are dealt with heavily and uninspiringly; and he manages to stuff up Zeno too. Really, I should have given up at that point.
If you really really like lots of dinosaur information... then read wikipedia, not this.