Browsing Tree-Ring Bulletin, Vol. 33 (1973) by Submit Date
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Tree-Ring Bulletin, Volume 33 (1973)Tree-Ring Society, 1973Contains: Tree-Ring Research in Ireland, A Simple Crossdating Program for Tree-Ring Research, and A Recently Developed Irish Tree-Ring Chronology
A Recently Developed Irish Tree-Ring ChronologyAn initial study of samples from 30 recently felled Irish oak trees established the validity of the dendrochronological method in Ireland and provided a standard chronology from A.D. 1649 to the present. Using timbers from previously undated post-medieval buildings in the north of Ireland this chronology has been extended back to A.D. 1380. The chronology has been used for the dating of numerous post-medieval timbers, of which two groups are discussed.
A Simple Crossdating Program for Tree-Ring ResearchA crossdating program for tree-ring research has been written to compare ring patterns of individual trees and composites. The program written in FORTRAN calculates the t value for correlation at every point of overlap of the two chronologies. The program is small enough to be used on a routine basis with a large number of trees. As the chronologies must be free from errors, the program is more suited to the study of oaks than coniferous trees.
Tree-Ring Research in IrelandTree-ring studies started in the Palaeoecology Laboratory in 1968. The impetus for the work was provided by the large amount of sub-fossil oak and pine that was brought to our notice by archaeological excavation and road construction. Sample preparation and ring measurement techniques were developed and crossdating was demonstrated in some of the sub-fossil material. A program of field collection was started and a research assistant employed on the laboratory treatment of samples. Good crossdating over a wide area was then established for both oaks and pines, demonstrating an overriding climatic influence on tree growth even under bog conditions. A number of floating sequences in excess of 500 years length have been constructed and timbers have been found from every half millenium back to 8000 radiocarbon years before present. Over 1400 timber samples have been collected and a large amount of material remains to be collected.