Here are a few of those fragments.
Herto skulls (Homo sapiens idaltu)
Some new fossils from Herto in Ethiopia, are the oldest known modern human fossils, at 160,000 yrs. The discoverers have assigned them to a new subspecies, Homo sapiens idaltu, and say that they are anatomically and chronologically intermediate between older archaic humans and more recent fully modern humans. Their age and anatomy is cited as strong evidence for the emergence of modern humans from Africa, and against the multiregional theory which argues that modern humans evolved in many places around the world.
Of course, thats about all they will ever be able to study in detail, so they have to fill in some blanks...leaves them open to criticism.
Actually, I'm facinated by DNA/Genetic analysis....Google Haplogroup sometime. Talks about y Chromosome mutations which likely occurs once every few thousand years or so.