That is, scientists cannot tell exactly how old the layers are in years to the present date, only which is older than the other.Techniques such as radioactive dating, including carbon dating, focus more on the absolute age of an object.Many new techniques are being developed and tested.
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.
If two observers, Janet and Jim, are moving in opposite directions and as they pass by each other they note that the other person's watch is ticking slower than their own.
If Judy were running alongside Janet at the same speed in the same direction, their watches would be ticking at the same rate, while Jim, going in the opposite direction, sees both of them having slower-ticking watches.
Correlation of fossil inclusions is a principle of stratigraphy: that strata may be correlated based on the sequence and uniqueness of their floral and faunal content.
SYNONYMS OR RELATED TERMS: chronology CATEGORY: technique DEFINITION: The process by which an archaeologist determines dates for objects, deposits, buildings, etc., in an attempt to situate a given phenomenon in time.
Time dilation is the phenomenon where two objects moving relative to each other (or even just a different intensity of gravitational field from each other) experience different rates of time flow.
The time dilation seen due to relative velocity stems from special relativity.
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Actual samples of ancient atmospheres are trapped in air bubbles within the ice. CATEGORY: feature DEFINITION: A pattern of parallel ridges resulting from the plowing of strip fields in medieval and later open field systems.