Did they go extinct before the arrival of man, or were there tyrannosaurus regi, brontosauri, and velociraptors running about, and pteranadons and archaeopteryx fluttering about Eden with Adam and Eve?
What about the various plants that can't live with today's oxygen mix. Were they growing in some noxious hollows of the world, where the atmosphere was primarily carbon dioxide and methane (and didn't mix with the oxygenated atmosphere in which we live?
Why not? The Flood could have wiped them out. It could have wiped a lot of things out. And there is evidence of a deluge.
Never heard of those plants but even today there are creatures that live in thermal vents in the oceans which would die in the normal ocean environment. There are other equally inhospitable environments in caves and some very isolated inland lakes that contain life, too. They made a great IMAX movies about them.