Hutch said:
The deposition of layers varies according to terrain and natural events - sure, some dinosaur fossils are found closer to the surface than others. Are you suggesting that the observation that ALL dinosaur fossils are not found in the exact same layer (and presumably at the same depth) is evidence against fossil dating techniques?
The most accurate form of dating fossils relies on radioisotopic measurements. The ratio of radioactive isotopes (such as rubidium/strontium and potassium/argon). Due to radioactive decay, the ratios of these two isoforms varies depending on the age of the rock. Such rocks that form around fossils can be accurately dated by comparing their ratios with those from newly formed rocks. Over the last 80 or 90 years, scientists have made tens of thousands of measurements, refining these values to such an extent that determining the age of fossils is now very accurate.
The most accurate form of dating fossils relies on radioisotopic measurements. The ratio of radioactive isotopes (such as rubidium/strontium and potassium/argon). Due to radioactive decay, the ratios of these two isoforms varies depending on the age of the rock. Such rocks that form around fossils can be accurately dated by comparing their ratios with those from newly formed rocks. Over the last 80 or 90 years, scientists have made tens of thousands of measurements, refining these values to such an extent that determining the age of fossils is now very accurate.