How well do paleontologists know fossil distributions?

“Scientists often use the presence of index fossils to estimate how old a given layer of rock is. The problem is that many virtually identical specimens are found in different geologic layers and separated from one another. Based on the standard uniformitarian assumptions, these specimens are given different names. This overstates the actual number of species found in the fossil record and confuses their distribution. There are often large gaps of missing time between the two specimens. Evolutionists have trouble explaining why the species is not found in the layers between the two fossil specimens, but creationists have no difficulty. The Flood model explains the wide distribution and the different levels as the organisms were buried in different places during the same Flood event. The actual three-dimensional distributions of fossil species is not known by paleontologists, but it is used to prove that evolution and evolutionary time are true.” Evolution Exposed, Second Ed., How well do paleontologists know fossil distributions?, Oard.

How well do paleontologists know fossil distributions?