Geology assuredly does not reveal any such finely-graduated organic chain; and this, perhaps, is the most obvious and serious objection which can be urged against the theory. The explanation lies, as I believe, in the extreme imperfection of the geological record.1
It continues today. This is quite unfortunate for Darwinists, but it does not shake their faith in naturalistic evolution one bit. Because, from their worldview, evolution is true. If there is any evidence against evolution, there is an explanation. In this case, it is that the fossil record is incomplete.
Both the Creationists and IDists have better explanations for the fossil record. Their explanations have more explanatory power. Both provide an explanation for the apparent gaps. To Young Earth Creationists, there is no gap. There was a natural sorting during the great flood. To many, but not all, IDists, an Intelligent Designer shaped the common descent of species by modifying the design at various points.