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While the exchange of inorganic carbon occurs much more readily, the relative chemical inertness of biopolymers makes them ideal for dating; therefore, the majority of bone radiocarbon dates are obtained from the collagen phase.
When a pair of values is provided, either the start or the end can be written first; The first century starts at 0001-01-01 AD, although they did not know it at the time.
The method was then applied to two archaeological sites where reliable dates were obtained from the single bones of small mammals.
These results open the way for the routine dating of small or key bone samples. bones, teeth, antler and ivory) found in the fossil record have a tremendous informative potential relevant to the fields of archaeology, palaeoecology and the history of art and technology.
The first two forms will not be evaluated until the default value is used, because they are function calls.
Thus they will give the desired behavior of defaulting to the time of row insertion.