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    Chronometric absolute dating techniques are based on

    Continuous cores, sometimes taken to the bedrock below, allow the sampling of an ice sheet through its entire history of accumulation.

    Can yield environmental evidence as far back as 3mya`Based on observation that the annual growth rings of a few tree species vary in width according to differences in seasonal growing conditions (esp. Successful means of calibrating or correcting radiocarbon dates2.Among the most useful chronometric dating techniques are radiocarbon dating, potassium argon dating, and thermoluminescence dating.Dendrochronology, the relationship of dated ancient trees with live trees has no CATEGORY: technique DEFINITION: The use of various methods, often multiple methods, to demonstrate the equivalency of stratigraphic units.Drawback: some minerals don't capture sufficient amounts of sunlight, therefore are dated as older... Based on principle that when volcanic obsidian is fractured, it starts absorbing water from its surroundings, forming a hydration layer that can be measured.No universally valid rate of growth or hydration rate. Does not give info about date of a rock engraving, but about the length of time that the rock surface in Q has been exposed since the geological even leading to dating.

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