Relative dating is the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age (i.e., estimated age). 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. The Law of Superposition, which states that older layers will be deeper in a site than more recent layers, was the summary outcome of 'relative dating' as observed in geology from the 17th century to the early 20th century.
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Relative chronology in the context of Minoan chronology
Minoan chronology is a framework of dates used to divide the history of the Minoan civilization. Two systems of relative chronology are used for the Minoans. One is based on sequences of pottery styles, while the other is based on the architectural phases of the Minoan palaces. These systems are often used alongside one another.
Establishing an absolute chronology has proved difficult, since different methodologies provide different results. For instance, while carbon dating places the eruption of Thera around 1600 BC, synchronism with Egyptian records would place it roughly a century later.