Its not missing.
Mostly within the past 60 years, our culture has had a wondrous gift bestowed upon us - fossils showing the evolution of our species from an upright-walking creature with a brain the size of an ape's. And in the same time we've been gifted with other wonders - the understanding of the genetic code (which was a great test of evolution's validity -- it passed) and the inner workings of all life necessary to learn more and more about the mechanisms and origins of our planet's life,
and the deeper understandings about our universe and the structure of matter that allow us to understand the mechanisms and origins of the universe we inhabit.
For your reading pleasure re: fossils:
http://www.discovery.org/scripts/viewDB/filesDB-download.php?id=119