For instance, if we find a fossil bone below the strata 3 rock level shown above, we assume that the animal most likely lived at a time before that layer was formed.
However, we must be careful to note whether or not the fossil comes from the mixed strata zone of the filled in hole..
In the past, relative dating methods often were the only ones available to paleoanthropologists.
However, relative methods are , which is that if there are layers of deposits, those laid down first will be on the bottom and those laid down last will be on the top. However, geological strata are not always found to be in a neat chronological order.
Wind and water erode strata and some areas are uplifted or even tilted.
The skull and jaw clearly were not from the same time period.
The jaw was likely to have come from a modern young adult orangutan.
can be used to tell us whether or not the animals they were from actually lived at about the same time.