No fossil is buried with its birth certificate. That, and the scarcity of fossils, means that it is effectively impossible to link fossils into chains of cause and effect in any valid way.
According to Henry Gee, we call new fossil discoveries missing links
as if the chain of ancestry and descent were a real object for our contemplation, and not what it really is: a completely human invention created after the fact, shaped to accord with human prejudices.
To take a line of fossils and claim that they represent a lineage is not a scientific hypothesis that can be tested, but an assertion that carries the same validity as a bedtime story—amusing, perhaps even instructive, but not scientific.” – Henry Gee, In Search of Deep Time: Beyond the Fossil Record to a New History of Life (New York: The Free Press, 1999), pp. 32, 113-117.
People shouting that “Evolution is fact, fact, FACT!”* do not make this problem go away.
“Evolution” is not a fact anyway, it is an abstraction. And what is the exact series of events of which it is an abstraction? There is where we need the scientist.
Shouting “fact, fact, FACT!” is best consigned to lobbyists and politicians, the way things naturally find their level.
*Michael Ruse, Darwinism Defended: A Guide to the Evolution Controversies, (Addison-Wesley, 1982) 1983, Third Printing, p.58. Emphasis Ruse’s.