They believe humans and dinosaurs existed at the same time. Dinosaurs went extinct, but humans continue. Creationists believe all creatures were created at once, but they do not rule out the possibility of extinction of some species before others.

There are creationists who cite hard evidence of the coexistence of dinosaurs and humans, usually footprints of the latter and the former mixed together. This evidence is not accepted by all.

Like all anomalists, however, their evidence always sounds very convincing: lots of footnotes, testimony, contradictions in their opponents' writings, even photographs. They are totally baffled why anyone else can't see it, no doubt blaming it all on the devil.

When I worked for Gulf OIl, we used to have a creationist paleogeologist there, whose job was to date geologic strata from drill cores by the microfossils that could be counted there. In his case, it was the shells of little marine critters called foraminifera, or "forams", for short. Certain species tended to concentrate in certain geological eras.

When asked how he could reconcile this preposterous contradiction (apparently he was quite good at his job) his reply was that he identified the geologic era of the rocks (Cretaceous, Triassic, etc) according to agreed scientific standards, but did not think those eras were separated by millions of years.

You never can tell. I have a childhood friend with a Master's degree in Organic Chemistry from Columbia University, who believes in astrology, spirits, Castaneda shamanism, and several other weird things. He used to be a Southern Baptist creationist, and we used to have incredible arguments in high school, too, until one day his father pulled him aside and told him, "Son, ER is right. I just follow what I hear in church to keep the peace with your mother."

Roger was never quite the same after that. He is no longer a Christian, but his in-depth knowledge of scripture makes him fun to watch in an argument with anyone who is.