[dinosaur] Dating of dinosaur age during history

[Poekilopleuron <dinosaurtom2015@seznam.cz>]

Good day,

I seem to recall that at the beginning of the 20th Century it was believed that Tyrannosaurus was only about 3 to 8 million years old (and Protoceratops about 13 million years after 1920). Is there any table of age estimates for dinosaurs and how it was improved during the time? E. g. how K-Pg boundary was dated from the 19th Century up to modern estimates of 66.0 mya. I have seen that around 1950 it was thought to be some 75 to 70 million years ago? Thank you in advance! Tom