Because this assignment is linked with your work in Assignment 3, you will have "If Scientists Think. Before scientists had modern technology to assist them in their research, they had to use their power of observation to infer the relative ages of the rocks they were studying.
But sometimes, a scientist finds a couple of rock outcrops that are separated by a wide distance.
Watch this video to find out how we use index fossils to establish the relative ages of rocks.
In previous lessons, we talked about the Geologic Time Scale and how scientists use it to piece together the history of the earth.
We talked about relative dating of rocks and how scientists use stratigraphic succession to compare the ages of different rock layers.
You should already understand that the lower rock strata are generally older than the strata found higher up in the rock.
Given the current status of direct chronometric dating methods for Arabian petroglyphs, it is rare that the precise age of a rock art panel can be determined.