However, even Darwin himself struggled with the fact that the fossil record failed to support his conclusions. "Why," he asked, "if species have descended from other species by fine gradations, do we not everywhere see innumerable transitional forms? . . . Why do we not find them imbedded in countless numbers in the crust of the earth?" (The Origin of Species, 1859, Masterpieces of Science edition, 1958, pp. 136-137).
This is not a problem for evolution. In the 150 years since Darwin many hundreds of transitional forms have been found. Darwin's publication was not the end of research, it isn't a sacred text that is frozen in time.
Here is an extensive, but not exhaustive, list of Transitional Vertebrate Fossils.
Here is another site with an example. Browsing this site starting at the home page is recommended, especially if you are new to the topic. There is an entire section on misconceptions.