Fossil succession relative dating

Four principles of stratigraphy give geologists ways to understand rock layers, including when and how they were created.

The Grand Canyon acts as a modern testament to stratigraphy and relative dating.

Because members of faunas can be distinguished from one another through time and because of the wide geographic distribution of organisms on the Earth, strata from different geographic areas can be correlated with each other and dated.The realization that sediments turn into rock was counter to the view that all rocks on Earth formed in a single creation event.Once Steno recognized that the fossils he was contemplating (sharks teeth and sea shells) were formed in the sediments of oceans he was able to work out the basic rules of stratigraphy.When geologists study layers of rocks, they get a glimpse of the past.Determining the precise way that sedimentary rocks have layered throughout time gives them insight into how natural events have occurred.