This book is a great read, even for people who don't know anything about Geology, palaeontology or any other ology. All of What I previously knew about dinosaurs was a distant memory from Jurassic Park, featuring my first ever on screen crush, Jeff Goldblum (though he plays a character I would despise now in my slightly older age).
The author mentions this a few times (JP not my feelings toward JG), almost as if he knows that that's where almost everyone's Prehistoric fascination and knowledge comes from.
The book is organised in a somewhat chronologic order of discovery while also taking us through the chronology of evolutionary time, and some of the mystery between the apocalypse of the dinosaurs dying out and modern animals rising out of the ashes.
I've always been a fan of T-rex, out of fear, but the author cannot stop himself from making a joke out it's classic disproportionate build. Referring to the arms of the t-rex as; pathetic, puny, laughably tiny, silly and sad, but then turns around at the last minute and describes them as "accessories to murder".
This has left me confused and wanting to watch all of the Jurassic Park movies again (including JW and JW2).
I would give it 4.5 stars (.5 lost for the references to T-rex's unconventional proportions) but then I added .5 for the acknowledgment of JP which I feel more people, particularly scientists, should appreciate.
TL/DR: great book, not too long, you should read it