If the theory of evolution were correct, the fossil record should be continuous-simplest to more complicated. But there are gaps between, e.g., invertebrates and vertebrates, reptiles and mammals etc. Evolution is tied to uniformitarianism and creationism is tied to catastrophism . All changes explained by mechanisms currently at work. A suggestion that many changes occurred by processes not currently observed at rates not now seen.
Geological record supports catastrophism because of discontinuities and existence of fossils.
More on Catastrophism Many kinds of plants and animals have remained essentially unchanged throughout history. Algae, jellyfish, ferns, cockroaches, crocodiles are essentially unchanged. Difficult to reconcile with evolution. Suggests that all forms began at same time. Evolution requires that new life forms arise from mutations.