Right. Very few, if any, would have survived extinction.
However, especially with sea creatures, this might be possible.
But land-based dinosaurs, even in remote jungles, seems unlikely. During such a long time, one would think there would be significant evolutionary changes(such as birds), as opposed to a massive dinosaur family roaming remote jungles. But who knows!
Maybe one will turn-up. Not holding my breath on that, though.
All dinos lived on land. The flyers and swimmers were lizards, like the crocs. today are.