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A new chronology from Truckee River Canyon
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By counting tree growth rings it is possible to establish the year of birth of a tree. Moreover, the ring width measurement can provide important information about the past climatic history of a place. In fact, the trees of temperate areas, having evolved with the alternation of the four seasons, enter into vegetative rest with the arrival of winter and they produce late wood. With the beginning of spring, accompanied by rain recovery, they produce spring wood, lighter than late, due to the greater width of xylem vessels. Consequently, the rings are clearly visible and recognizable from each other in that they are formed from a light part (spring wood) and a dark part (autumn wood). So, if a ring is wide then it means that it was a rainy year and if it's narrow means it was a dry year (without considering the ecological factors that also affect the ring width). Based on this, my work is aimend to get a master-chronology through the cross-dating process using statistical software such as Cofecha or R. In this way I'll get an graphic that show the average of the chronologys of each trees based on the same pattern between cores from the same tree species. The area under study is located in a wilderness area on the Californian side of Lake Tahoe, on steep and stony slopes overlooking the Truckee River Canyon. The differents tree cores samples collected from Pinus jeffreyi Murray allowed me to build a new chronology around Lake Tahoe.