Much less than 1% of dead plants and animals are preserved as fossils, most are eaten or simply rot away. A corpse
must be buried rather quickly to be preserved, because something will eat it (from opportunistic predators to bacteria) if it isn't. Fully articulated skeletons wouldn't be found otherwise. Also, that's why it's common, especially for terrestial life, to be found in large beds: a catastrophe killed them all at once (be it large scale, like a meteorite, or small scale, like a collapsing river bank). All the hub-bub shows nothing more than the conditions required for something to potentially become a fossil.
Another thing: the boundaries in the geologic time scale are almost all due to mass extinctions. However, these boundaries are separated by long periods (sometimes 100s of millions of years) of relative geologic quiet.
And radiometric dating is still a relatively new science. For that matter, geology as a formal science is only about 150 years old. As with any scientific endeavor, accuracy increases over time.
Many of the foundation precepts of geology may well be changed radically in the future, but it will be because of study, research, and experiments, not looking for facts to fit a particular theory.
OK, my mini-rant is over
