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It is possible, particularly in dry, desert climates, for organic materials such as from dead trees to remain in their natural state for hundreds of years before people use them as firewood or building materials, after which they become part of the archaeological record.Thus dating that particular tree does not necessarily indicate when the fire burned or the structure was built.By measuring the carbon-14 in organic material, scientists can determine the date of death of the organic matter in an artifact or ecofact.
An additional problem with carbon-14 dates from archeological sites is known as the "old wood" problem.
In addition to the modern materials like reinforced concrete, the new 1920 San Siro boasted a number of other improvements: indoor plumbing; electricity, including lighting for the track; telephone; telegraph; pneumatic post; cinematography at the finish line; signals and services and, most importantly for our purposes, "la macchina coi nastri che regolarizza la partenza" (Parini); that is, the machine or apparatus with tapes that regulates the horses' departure as the race begins.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'chronometric.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors.
Coins found in excavations may have their production date written on them, or there may be written records describing the coin and when it was used, allowing the site to be associated with a particular calendar year.
In historical geology, the primary methods of absolute dating involve using the radioactive decay of elements trapped in rocks or minerals, including isotope systems from very young (radiocarbon dating with Radiometric dating is based on the known and constant rate of decay of radioactive isotopes into their radiogenic daughter isotopes.