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Due to the sweeping and diverse applications of this data, specialists can come from many academic disciplines.
There are no degrees in dendrochronology because though it is useful across the board, the method itself is fairly limited.
He was right, and the more trees that were added to the record, the greater the size of the data could be extrapolated and the more complete picture we could build of our past climate.
It was not until the 1970s that archaeologists saw the benefits of the use of tree ring data in their own field (8), even though Douglass himself had used his method to date many prehistoric North American artefacts and monuments that had previously not been satisfactorily placed into a definite chronology.
This says nothing about either when the particular tree was felled, nor about the date it was used (8).
In past times, good quality timber may have been reused (10) and for the archaeologist, it is important to check other records against the new data.
He theorised that tree rings could be used as proxy data to extend climate study back further than had previously been permissible.
Some trees are also better than others for study (5). In this article we make the assumption that growth is annual with a distinct growing season.
Most tree species are reliable; oak is the most reliable tree type for tree rings - with not a single known case of a missing annual growth ring.
From the 1980s, several seminal studies began at the University of Arizona (6), (7) studying the bristlecone pine of California and hohenheim oak in Germany.
Thanks to the work of these studies, we now have an 8,600 year chronology for the bristlecone pine and in the region of 12,500 year chronology for the oak.
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Most people who enter into studying tree rings typically come from one of several disciplines: Though dendrochronology also has uses for art historians, medieval studies graduates, classicists, ancient and historians due to the necessity to date some of the materials that the fields will be handling in their research projects.