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Announcing the Florence Ellis Hawley Diversity Award!This award recognizes an early-career scientist's accomplishments in dendrochronology with travel support to Bhutan for World Dendro 2018 and giving a named lecture at the meeting.By using dendrochronology scientists have dated certain living trees or their root systems in certain cases as having ages in excess of what is expected given the Biblical chronology of the global flood.

Paleo Event Data Standards for Dendrochronology Workshop, 10 to 14 September 2017 in Woodland Park, Colorado.

Dendrochronologists with data management and with dendroecological, -meterological, -hydrological, and -geological interests are sought to develop new data standards for event chronologies.

Tree-ring series can be classified as either complacent (uniform ring widths where moisture and heat are sufficient throughout the growing season) or sensitive (pronounced year to year variation in ring width, where conditions are frequently near the limits of the trees tolerance, e.g. The search for proxy climatic data was the original application of tree rings. In 1901, he noticed ring-width variations on a cut log and reasoned that these were controlled by the tree's environment (Fritts, 1976).

Douglass (1920) illustrated the relationship between climate and ring width by plotting both against time, and introduced the technique of cross dating by correlating ring-width signatures (sequences of wide and narrow rings) among trees distributed over large areas.

As soil water declines through the summer, the cells become thicker-walled and more dense.

Thus each annual ring consists of early (light) and late (dark) wood. Douglass, the 'father' of dendrochronology was interested in the affect of sunspots on the earth’s climate.Dendrochronology (also called tree-ring dating) is a technique of dating past climatic changes through a study of tree ring growth.Each year a tree adds a layer of wood (xylem) to its trunk and branches thus creating the annual rings we see when viewing a cross section.If you compare the two curves carefully you will find that there are close points of similarity between them.Though the overall growth rates differ, the variation over time is similar.This diagram shows the width of each tree ring in both samples.