Tree-ring dating

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He discovered a correlation between tree rings and the sunspot cycle , and founded the discipline of dendrochronology , which is a method of dating wood by analyzing the growth ring pattern. He started his discoveries in this field in when he was working at the Lowell Observatory. During this time he was an assistant to Percival Lowell , but fell out with him when his experiments made him doubt the existence of artificial " canals " on Mars and visible cusps on Venus. Craters on the Moon and Mars are named in his honor. Almost immediately upon his arrival in Tucson, Douglass re-established his astronomical research programs using an 8-inch refracting telescope on loan from the Harvard College Observatory and actively began to pursue funding to construct a large research-class telescope in Tucson.
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Global Historical Climatology Network Monthly - Version 4

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Carbon - Wikipedia

By Hunter Oatman-Stanford — November 13th, In , a geologist in the Nevada wilderness discovered the oldest living thing on earth, after he killed it. The young man was Donald Rusk Currey, a graduate student studying ice-age glaciology in Eastern Nevada; the tree he cut down was of the Pinus longaeva species, also known as the Great Basin bristlecone pine. Working on a grant from the National Science Foundation, Currey was compiling the ages of ancient bristlecone trees to develop a glacial timeline for the region. Sheltered in an unremarkable grove near Wheeler Peak, the bristlecone he cut down was found to be nearly 5, years old, taking root only a few hundred years after human history was first recorded.
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Growth ring

When some Christians first consider the possibility that Earth might have a much longer history than a few thousand years, they face a daunting challenge. Conventional scientists claim that dating methods are robust and reliable, but young-earth advocates insist that all are based on untestable assumptions and circular reasoning. Without the tools or expertise to independently evaluate the competing claims, many Christians default to the young-earth view, assuming there must be scientific justification for the young-earth claims.
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The full dendrochornological potential of the park, however, has not yet been tapped. Dendrochronological research on archeological and living wood in the park holds the potential to more accurately date building construction phases and provide insights into climate changes and human adaptation to these changes. Since , I have been involved in an archeological tree-ring dating program that focuses on collecting samples from some of the last datable beams remaining in the park.
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