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1) Because they are not readily observeable in the world and 2) because they have dated dinosaur bones to be millions of years old. To survive unchanged for 65 million years is pretty much unthinkable in evolutionist terms.

You're right and you're wrong. First, living a long time ago does not mean a group cannot still exist today. Otherwise we evolutionists would be hopelessly boggled by sharks, insects, lampreys, corals--all sorts of groups that are very ancient. Secondly, no organism has survived unchanged for millions of years. Modern examples are different species than the extinct ones. For instance, the living coelecanth is a different species than any fossilized ones, and much larger (most fossil specimens are about 8 inches long). The Wollemi pine also is a different species than the extinct members of its genus (and just a baby--its cousins are found fossilized just 2 million years ago).