Relative dating is the science of determining the relative order of past events i. In geology, rock or superficial deposits , fossils and lithologies can be used to correlate one stratigraphic column with another. Prior to the discovery of radiometric dating in the early 20th century, which provided a means of absolute dating , archaeologists and geologists used relative dating to determine ages of materials. Though relative dating can only determine the sequential order in which a series of events occurred, not when they occurred, it remains a useful technique. Relative dating by biostratigraphy is the preferred method in paleontology and is, in some respects, more accurate.
What are some limitations of radiometric dating
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The Burgess Shale fossils are preserved in a type of sedimentary rock known as shale. Shale is a type of mudstone or mudrock that originally formed from deposits of fine mud, made mostly of clay minerals. The different fossil layers of the Burgess Shale represent different mud deposits, originally laid down in sheet-like horizontal beds ranging from a few millimetres up to several centimetres in thickness. These layers can still be seen today in the Burgess Shale. Layers from the Phyllopod bed in the Walcott Quarry showing the original stacks of horizontal mud beds now transformed into shale.
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Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site. Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating. Stratigraphy is the oldest of the relative dating methods that archaeologists use to date things. Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first. In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers.