I also love thousands of books but now I thought of Centennial by James A. Michener.
"When the earth was already ancient, of an age incomprehensible to man, an event
of basic importance occurred in the area which would later be known as Colorado.[…]”
[...]Three billion, six hundred million years ago the crust had formed, and the
cooling earth lay exposed to the developing atmosphere.[...]
[...]With slow, lumbering strides the reptile moved toward a clear river that emptied into the swamp, and now its total form was visible. Its head reared thirty-five feet; its shoulders were thirteen feet high; its tail dragged aft some fifty feet; it weighed nearly thirty tons.
It was diplodocus, not the largest of the dinosaurs and certainly not the most
fearsome. This particular specimen was a female, seventy years old and in the
prime of life.[...]
[...]She was looking for a stone. For some time she had instinctively known that she lacked a major stone, and this distressed her. She had become agitated about the missing stone and now proposed settling the matter. Keeping her head low, she
scanned the bottom of the stream but found no suitable stones. [...]
[...]It was a cruel land, that year when man arrived. The New Rockies rose perhaps
a millionth of an inch; certainly they did not stand still, for they never had and they
never would. They were either rising in birth or falling in decay, and in time to
come they might be higher than the Himalayas or lower than the Appalachians.[...]"http://en.wikipedia.org/wiki/Centennial_%28novel%29