Making this processes even more difficult is the fact that due to plate tectonics some rock layers have been uplifted into mountains and eroded while others have subsided to form basins and be buried by younger sediments.
With out individual time stamps the process of dating these structures could become extremely difficult.
This feature is produced by changes in deposition over time.
With this in mind geologist have long known that the deeper a sedimentary rock layer is the older it is, but how old?
But, how can we determine how old a rock formation is, if it hasn’t previously been dated?
Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.
The earliest-known hominids in East Africa are often found in very specific stratigraphic contexts that have implications for their relative dating.
Relative dating methods allow one to determine if an object is earlier than, later than, or contemporary with some other object.Chronometric dating, also known as chronometry or absolute dating, is any archaeological dating method that gives a result in calendar years before the present time.Archaeologists and scientists use absolute dating methods on samples ranging from prehistoric fossils to artifacts from relatively recent history.The majority of the time fossils are dated using relative dating techniques.Using relative dating the fossil is compared to something for which an age is already known.