That every species of plant and animal that exists today, has existed since the beginning of time. Humans, trilobites, and dinosaurs, coexisted. Yet, if you go to continuous sedimentary layers of rocks, eg. Grand Canyon, you clearly see there are species at the lower (older) layers that aren't at the top, and species at the higher (younger) layers that aren't at the bottom. And this same sequence of fossil species are repeated all over the world in different cross sections of sedimentary layers, time after time after time.
In the Gulf of Mexico, where we have drilled 40,000 wells, we see the same thing with microfossils. As we drill down from younger to older sediments, the species come and go, and the same sequence of the same species is repeated over and over and over in every well. Otherwise, they would not use paleontologists in oil exploration. But they do, and rely quite heavily on the paleontologist identifying the age of the layers.
How do creationists explain this? Did God decide to come back and put new species on the earth every few years, every few hundred years, every few thousand years? Considering how many differnet species of plants, insects, mammals, reptiles, etc., that would have kept God mighty busy!
For this discussion, it doesn't matter if the earth is 6,000 years old or 6 billion years old, what matters is that there is indeed a continuous change in the plants and animals over time. It doesn't matter if you call this micro- or macro- evolution, the point is that you have distinct change in the living organisms that is recorded in sediments. Even if you don't believe that man evolved from different ancestors, how can you dispute this clear and overwhelming proof that plants and animals changed from one to another?
'Cause there's a monster on the loose