Accuracy of ancient dating methods
Carbon dating in geology may be relative or absolute.One does relative dating by observing fossils sequences using the stratigraphical method.One fact was soon clear, no dinosaur record could be found to coincide with a human fossil record.So it was apparent that there was some kind of 'progress' going on.Early geologists, at the end of the 18th and early 19th century noticed how fossils appeared in certain sequences: some fossil assemblages were always found below other assemblages, not above.
The order of appearance in a sequence is well documented, but that is not all.
Phylogeny, mathematics, and other methods used to date fossils.
Biologists now have at their disposal a variety of independent means to look at the history of life.
This lead to the recognition of one of the principles of geology, i.e., stratigraphy, older rocks lie below younger rocks and that fossils occur in a particular, predictable order.
The next step was for geologists began to build up the stratigraphic column.