It is reasonable to believe that one or more of the early species of Human Beings, at one time or another, must have discovered the remains of what we now know as being some type of dinosaur. Then again, we certainly do not know how many dinosaurs did survive after the end of the Cretaceous Period of the ongoing evolution of life on our Earth.
Very few dinosaurs were found in rock strata above the layer of deposits that are younger than 65 million years ago. So too, there is very little evidence within the fossil record that fully brings to light the way in which early Man made its way on the Earth those 2 or 3 million years ago. It is true that some of them drew pictures but you better believe that most of their drawings are truly gone forever. Nor does it appear that any of those people knew how to read or write.
They, like the other animals, were most concerned with finding food, creating more of their kind and finding a place to shelter them from the climate. Just staying alive must have truly been a difficult task. That is why Mankind eventually made tools and created a spoken and a written language to pass down the knowledge of those who came before them.
It is also true that those who knew how to read and write were those who were at top and in control of the population within the area in which they lived. Yes, education was reserved for those who were priests, kings and/or scholars who made a record of their activities or what they themselves learned from the environment.
As a result, if an ordinary person should happen to find the remains of a dinosaur, that event would certainly not be recorded for the reading pleasure of future generations. Then again, people did find the remains of dinosaurs but believed that they were the bones of dragons or some such mythical creatures that were a part of their religious beliefs.
As an example, some people believed that the bones of dinosaurs were the remains of animals that perished during the great flood of biblical times. However, the Greeks were very good at recording what they saw and/or experienced during their lifetime.
One of those people was Herodotus. About the 5th Century B.C. he wrote about the discovery of the bones of Griffins that were found within a nesting area within Central Asia. He truly did not know that those were the bones of dinosaurs, rather than a mythical creature that was half lion and half eagle.
It wasn't until the beginning of the 19th Century when naturalists begain to find dinosaur bones and tried to put them together. From those early attempts the science of paleontology came into being. More fossilized bones were found as technology advanced and allowed more to be learned about those creatures that we know as dinosaurs.