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Created with Fabric.js 1.4.5 Stratigraphy and the Principles of Relative Dating Relative dating falls under the sub-discipline of geology known as stratigraphy. Stratigraphy is the science of rock strata, or layers. Layering occurs in sedimentary rocks as they accumulate through time, so rock layers hold the key to deciphering the succession of historical events in Earths past. The fundamental principles of stratigraphy are deceptively simple and easy to understand, but applying them to real rocks and fossils can be quite challenging. Here are the four fundamental principles of stratigraphy that form the foundation of our understanding of Earths history: Stratigraphy and the Principles of Relative Dating Relative dating falls under the sub-discipline of geology known as stratigraphy. Stratigraphy is the science of rock strata, or layers. Layering occurs in sedimentary rocks as they accumulate through time, so rock layers hold the key to deciphering the succession of historical events in Earths past. The fundamental principles of stratigraphy are deceptively simple and easy to understand, but applying them to real rocks and fossils can be quite challenging. Here are the four fundamental principles of stratigraphy that form the foundation of our understanding of Earths history: double click to changethis text! Drag a cornerto scale proportionally. Adapted from Lutgens and Tarbuck. They cite the Geological Society of America as the source of the data. There is another kind of time division used - the "eon". The entire interval of the existence of visible life is called the Phanerozoic eon. The great Precambrian expanse of time is divided into the Proterozoic, Archean, and Hadean eons in order of increasing age. The names of the eras in the Phanerozoic eon (the eon of visible life) are the Cenozoic ("recent life"), Mesozoic ("middle life") and Paleozoic ("ancient life"). The further subdivision of the eras into 12 "periods" is based on identifiable but less profound changes in life-forms. In the most recent era, the Cenozoic, there is a further subdivision of time into epochs.
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