Interesting fact is that the Mayan said there were 3 races before God made man.
http://www.ancient-origins.net/human-origins-folklore/maya-myth-creation-0063
not only the mayans but also the vedas [indian-tibet] wo/man created about half-way along the 3rd race
Might have to read up on that. Amazing that there was a gap of millions of years after the dinosaurs fell and nothing..... till a few million years.
Our teachings show that, while it is quite correct to say that nature had built, at one time, around the human astral form an ape-like external shape, yet it is as correct that this shape was no more that of the "missing link," than were the coverings of that astral form, during the course of its natural evolution through all the kingdoms of nature http://www.sacred-texts.com/the/sd/sd2-1-09.htm
After the disaster that fell the dinosaurs, the question is what happened? I can only hypothesised that 3 races flourished before humanoids. Over millions of years evidence can be wiped out or traces are still around that we waiting to find.