Relative dating techniques to determine the age of rocks and fossils
Relative dating technique is used to arrange layers of rock or geologic events in chronological order. This method does not give any information about the ages of the geological event. The study of layered sedimentary rocks is called stratigraphy. Stratigraphy employs the following principles to study the layers of rocks:
Principle of superposition: Sedimentary rocks are arranged on top of another in a sequence. The oldest layer is found at the bottom, and the new layer is at the top. The positioning of the rocks in a sequence is known as the principle of superposition.
Principle of horizontality: The study of the sedimentary rocks that are laid one above the other in flat or horizontal layers is known as the principle of horizontality.
Principle of lateral continuity: It is the study of sedimentary rocks that extend sideways. These rocks are found in the basin. Strata of these rocks can be cut by river flow or canyon, but these strata are continuous on either side. This is known as the principle of lateral continuity.
Principle of cross cutting: Sedimentary rocks are sometimes disturbed and they cut across the layers after the deposition of rocks by faulty movements. This is known as the principle of cross-cutting.
Principle of faunal succession or correlation: The principles of superposition, lateral continuity, horizontality, and cross-cutting give information about the order of the rocks in a particular position. They do not provide insight about the ages of the rocks at different areas. However, the fossil records of different organisms appear and disappear at the same geological time. The fossils that are embedded in the different layers of the rocks can give information about the age of the rock layer, even when the rocks are far apart. This process of matching fossils is known as correlation.
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