We know that it is older than Christendom, but whether by a couple of years or a couple of centuries, or even by more than a millenium, we can do no more than guess." [Rasmus Nyerup, (Danish antiquarian), 1802 (in Trigger, 19)].

The person who wrote these words lived in the 1800s, many years before archaeologists could accurately date materials from archaeological sites using scientific methods.

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Radiocarbon dating calibration distributed cache updating for dynamic source routing

Designed for research on glacial C-14 age conversion (PC-WIN). Win Cal25: The Groningen Calibration Program: By J. Canada Canadian Archaeological Radiocarbon Database. Main CARD searchable database of archaeological and vertebrate palaeontological sites in Canada.

van der Plicht, for Windows, upgraded with latest calibration data set (intcal04). Southeast Asia and Anatolia 14Sea Project: 14C database of Anatolia, the Aegean, and southeast Europe available in downloadable Excel files.

Win Cal25 is a Windows remake of the CAL25 DOS program. United Kingdom Archaeological site index to radiocarbon dates from Great Britain and Ireland: database of over 4000 dates from the British Isles. Search access via the Archaeology Data Service catalogue.

It has the same functionality as CAL25 but with a new user interface.. As described in: "Marine Radiocarbon Calibration Curve Spanning 0 to 50,000 Years B. Based on Paired 230Th/234U/238U and 14C Dates on Pristine Corals," by Richard G. Mortlock, Tzu-Chien Chiu, Li Cao, Alexey Kaplan, Thomas P. Oxford Radicarbon Accelerator Unit (ORAU) Datelist Index.

The relative dating method worked very well, but only in sites which were had a connection to the relative scale. When radiocarbon dating was developed, it revolutionised archaeology, because it enabled them to more confidently date the past, and to build a more accurate picture of the human past.

The archaeologist Colin Renfrew (1973) called it the development of this dating method 'the radiocarbon revolution' in describing its great impact upon the human sciences.

The C14 method has been and continues to be applied and used in many, many different fields including hydrology, atmospheric science, oceanography, geology, palaeoclimatology, archaeology and biomedicine.

All plants and animals on Earth are made principally of carbon.

Rasmus Nyerup's quote reminds us of the tremendous scientific advances which have taken place in the 20th century.

In Nyerup's time, archaeologists could date the past only by using recorded histories, which in Europe were based mainly on the Egyptian calendar.

Metabase: laboratory data management software system that can be used by LSC labs. United States NOAA Earth System Research Library (ESRL) 14CO2 data and Carbon Dioxide Information Analysis Center (CDIAC) data.