Why?
If you're going to try to "refute" evolution, it might be helpful to at least read an elementary school textbook on the subject. I do not think it means what you think it means.
Here's a hint for free: Because a species is extinct doesn't mean that it went extinct millions of years ago. The dodo hung around long enough for European explorers to see them in the New World. The passenger pigeon and the Carolina parakeet were around long enough for my grandfather to see them.
That mammoths coexisted with humans is not controversial. There is abundant evidence (ooooh, that word) of mammoths hunted and butchered by humans. It is fairly widely accepted that hunting by humans played a role in their extinction, but how great of a role is still the subject of debate.
The fact that you were heretofore ignorant of these facts does not make them new, and certainly doesn't poke any holes in a body of science that was aware of them long ago. Your own ignorance doesn't make much of an argument.
I've been around long enough to see my grandfather. (one of them anyway)
Hey, anybody seen a dodo bird recently?