The chances for a fossil to form are chancy at best.
My son-in-law and I had a long conversation about this. He'd seen a science programme which pointed out just how rare fossils are, and how rare the circumstances under which fossils can form.
Then you look at discoveries were a small fragment of bone upsets the 'human story' applecart ... we thought life began around IndoChina, then it moved to Africa; recent finds have pushed dates back millennia ...
In South London we have a park that, in the 60s, was populated by life-size sculptures of dinosaurs that roamed South London aeons ago. Today they are a laughing stock. In the decades since, we have learned so much more. I think not one of them is accurate, but they were all 'the real deal' in their day... and you wonder, are the latest models so accurate?
And yet ...
Despite breakthrough discoveries and their understandings, the basic premise stays the same, we simply have to move the variables, based on the latest data. So fossil finds are staggeringly rare, but no new find throws a spanner in the evolution machine, and for me this is telling, rather they require revised dates, places, etc., and open the way for further research.
But it cannot be said that the evidence we have disputes evolution, and the lack of evidence is not evidence of anything, so those who argue the lack of transitional species are really barking up the wrong tree ...
And surely,
H. habilis,
H. erectus,
H. rudolfensis,
H. gautengensis, H. ergaster, H. antecessor, H. cepranensis, H. heidelbergensis, H. neanderthalensis, H. naledi, H. tsaichangensis, H. rhodesiensis, H. sapiens, are all transitional in the sense that they are indicators of the development of species ... we're not the end result as such, we're just the most recent addition to the chain.
On the other hand, species who reach a kind of ecological/environmental 'ideal' or 'dead end' show no changes over many, many millennia. Who are they, crocs, I think, sharks, roaches, silverfish... their non-evolving is also part of the evolutionary argument.
And, as DA pointed out, the unravelling of the genome should have knocked evolution into touch if it was wrong, but the product is the contrary. And extraordinary, staggering, inspirational ... the capacity for cellular organisms to engage and combine and collaborate with each other and produce the most awesome life-forms.
In my view its quite likely that times/dates/places will change again and again, but the song remains the same, and that is one of the most telling arguments in support of evolution.
The contrary theory, that there is an Intelligent Designer mirco-managing and cooking up new species which occur spontaneously looks increasingly unlikely ...
... and if you start investigating the idea of an ID with the same critical application you apply to evolution, then the ID argument, it seems to me, starts to come apart... a Designer maybe, but the intelligence is questionable. Why on earth did he dream up the Black Death, or Leprosy, or Ebola? What does that say about the Designer?