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These sediments are deposited on top of younger sediments currently being deposited in the lake.
The resulting sequence from the bottom-most sediments would be oldest-to- young-to- older.
Relative time can not determine the actual year a material was deposited or how long deposition lasted; it simply tell us which events came first.
Cultural seriations are based on typologies, in which artifacts that are numerous across a wide variety of sites and over time, like pottery or stone tools.
If archaeologists know how pottery styles, glazes, and techniques have changed over time they can date sites based on the ratio of different kinds of pottery.
The most obvious feature of sedimentary rock is its layering.
This feature is produced by changes in deposition over time.