Unless you care to accept the challenge and show me any bones from say the last 5,000 years in the process of undergoing fossilization?
The
Bog Bodies are a pretty good example of that. They span a period of time from 8000 B.C. up to the middle of the 20th century. They're at many different levels of preservation, too. The oldest bog bodies are mostly just skeletons, but some of the more recent ones still have most of their skin and muscle.
I'd assume that when a bog body belongs to a dead World War II soldier, you wouldn't consider it to be from Noah's flood. But bog bodies exist at nearly every age between World War II and prehistory, so there's no easy place to draw a line between those bodies you think were buried by the Flood and those that were buried after it. In any case, some of the more recent bodies are clearly undergoing fossilization, and the older ones have undergone it already.
You don't even know if they are actually dinosaurs or birds.
If this makes a difference to you,
Answers in Genesis considers
Sinornithosaurus a dinosaur. They consider
Microraptor a bird, but I think this actually makes their position weaker, when you consider how similar the two animals' anatomies are to one another in the fossils I linked to. On the other hand, if you disagree with AiG and consider
Sinornithosaurus a bird, that doesn't really make the situation any easier, because
Sinornithosaurus is only slightly more birdlike than
Epidexipteryx and
Velociraptor.
The trouble with trying to find any dividing line between dinosaurs and birds is that there are fossils representing an unbroken sequence of anatomy from obvious dinosaurs (such as
Compsognathus and
Sciurumimus) to obvious birds (such as
Jeholornis and
Confuciusornis). Phil Senter demonstrated that in
this study using BDISTMDS, the baraminology software that's used by creationists. Answers in Genesis initially claimed that Senter had misused this software, but a few months later David Cavanaugh (a creation scientist) performed
his own analysis of this data, and got the same result. (Cavanaugh's study is the first one listed in that PDF.)
I've attached an image for a book I'm working on, that illustrates the problem creationists have to deal with in this area.