Here's "Evolution Outreach" on the "gappy nature" of the Fossil Record.
"Darwin used the words “extreme imperfection” to refer not to any personal character flaw but to the gappy nature of the fossil record (Darwin 1859). The vast majority of organisms that have lived on Earth never fossilized. Jellyfish and worms? Too squishy to fossilize very often. Butterflies? Too delicate, for the most part. Anything that lived on mountain slopes or in fast-moving rivers? Unlikely to be covered by sediment and preserved. Darwin saw such haphazard preservation as a serious problem for the theory of evolution. After all, he was proposing that different modern species share common ancestors—that organisms as different as lobsters and butterflies have the same great-great-great-great…great-grandparent species. Direct fossil evidence of all the intermediate forms connecting an ancestor to its modern descendents would have provided undeniable evidence in favor of his theory. In Darwin’s view, however, the fossil record provided no such support. Much of On the Origin of Species is taken up with marshalling other forms of evidence to support his ideas about common ancestry and natural selection."
https://evolution-outreach.biomedcentral...008-0105-0 Evolution is the god of the gaps.
"Darwin used the words “extreme imperfection” to refer not to any personal character flaw but to the gappy nature of the fossil record (Darwin 1859). The vast majority of organisms that have lived on Earth never fossilized. Jellyfish and worms? Too squishy to fossilize very often. Butterflies? Too delicate, for the most part. Anything that lived on mountain slopes or in fast-moving rivers? Unlikely to be covered by sediment and preserved. Darwin saw such haphazard preservation as a serious problem for the theory of evolution. After all, he was proposing that different modern species share common ancestors—that organisms as different as lobsters and butterflies have the same great-great-great-great…great-grandparent species. Direct fossil evidence of all the intermediate forms connecting an ancestor to its modern descendents would have provided undeniable evidence in favor of his theory. In Darwin’s view, however, the fossil record provided no such support. Much of On the Origin of Species is taken up with marshalling other forms of evidence to support his ideas about common ancestry and natural selection."
https://evolution-outreach.biomedcentral...008-0105-0 Evolution is the god of the gaps.