As I expected. You have no clue. You just full-frontally bought everything the article stuffed your mouth full of without a shred of hard, real details to go along with it - except for a few pictures of pterodactyl fossils

Good thing those scientists don't have any bias or anything.
What if the pterodactyls were discovered in the wrong type of rock? What if they were discovered with creatures from a different time period? You don't even think of these things because you're brainwashed into thinking they got it all covered without your inquiry, Dump. Hence lies the problem:
we don't have enough information, and what information is given is vague and biased.