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11-Feb-2018 12:52

When you talk about the Precambrian, Paleozoic, Mesozoic, and Cenozoic on Earth, or the Noachian, Hesperian, and Amazonian for Mars, these are all relative ages.Relative-age time periods are what make up the Geologic Time Scale.The more fossils you find at a location, the more you can fine-tune the relative age of this layer versus that layer.Of course, this only works for rocks that contain abundant fossils.

The USGS has a good introduction of Relative Dating to have you practice putting historical events in the correct order.Where are the oldest pictures, by year, going to be in your stack? Often igneous intrusions will cut across layers of rock.The principle of cross-cutting relationships states that the intrusions are younger than the rock they cut.Paleontologists have examined layered sequences of fossil-bearing rocks all over the world, and noted where in those sequences certain fossils appear and disappear.When you find the same fossils in rocks far away, you know that the sediments those rocks must have been laid down at the same time.

The USGS has a good introduction of Relative Dating to have you practice putting historical events in the correct order.Where are the oldest pictures, by year, going to be in your stack? Often igneous intrusions will cut across layers of rock.The principle of cross-cutting relationships states that the intrusions are younger than the rock they cut.Paleontologists have examined layered sequences of fossil-bearing rocks all over the world, and noted where in those sequences certain fossils appear and disappear.When you find the same fossils in rocks far away, you know that the sediments those rocks must have been laid down at the same time. If you did it like many people, you based your sentences on what you know normally happens when you make a lunch.