Dendrochronology estimates the age of trees by correlation of the various growth rings in their wood to known year-by-year reference sequences in the region to reflect year-to-year climatic variation.

Dendrochronology is used in turn as a calibration reference for radiocarbon dating curves.

Radiocarbon dating estimates the age of formerly living things by measuring the proportion of carbon-14 isotope in their carbon content.SYNONYMS OR RELATED TERMS: typology CATEGORY: technique DEFINITION: The classification of artifacts into types to compare artifacts or features across time and space, or to determine relative dates for sites.CATEGORY: typology DEFINITION: The study of classes with common characteristics; classification of artifacts; the systematic classification of artifacts or remains according to type, i.e. This is the first step in archaeological analysis and necessary in comparing assemblages and in determining time sequences.Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.Because of the distortions and lies spread by fundamentalists about scientific dating there is a need for a centralized source of information on the topic.Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.Many Christians have been led to distrust radiometric dating and are completely unaware of the great number of laboratory measurements that have shown these methods to be consistent.Groups of pottery, for example, may be assembled by those with long necks, those with handles, and those with a pedestal base.Within these may be sub-groups based on variations in handle shape or decoration.The familiar terms calendar and era (within the meaning of a coherent system of numbered calendar years) concern two complementary fundamental concepts of chronology.For example, during eight centuries the calendar belonging to the Christian era, which era was taken in use in the 8th century by Bede, was the Julian calendar, but after the year 1582 it was the Gregorian calendar.is the science of arranging events in their order of occurrence in time.Consider, for example, the use of a timeline or sequence of events.His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.