Ok for a first novel.

The Dinosaur Four - Geoff   Jones

Quite a good plot, especially if you like dinosaurs and time travel. 

Unfortunately I didn't find any of the characters very likeable, therefore I couldn't really get engrossed in the book and didn't really care who survived.

 The ending let it down too, it was confusing and a bit lax.

It was ok for a first novel but I will hope for more if a second one is written.