Cross dating in dendrochronology douglass
The student learns many facts and has much training.He can only dimly see which fact and which training will be of eminent use to him, but some special part of his education will take root in him and grow and pay for all of the effort which he and his friends have put into it. In this Observatory I sincerely hope and expect that the boundaries of human knowledge will be advanced along astronomical lines.After a couple of failed castings, the Spencer Lens Co.of Buffalo, New York produced the mirror for the Steward Telescope.These findings led to realization that relative dating could be used on many of the other ruins in the Southwest.Although promising steps had been made in solving the mystery of the ruins in the Southwest, in 1920 the American Museum of Natural History discontinued funding Douglass's research (Nash 1999: 24-30).Upon receiving this news, Wissler was certain that Douglass would make a crucial contribution to archaeology.
In his dedication address, Douglass recounted the trials and tribulations of establishing the observatory, then gave the following eloquent justification for the scientific endeavor: This installation is to be devoted to scientific research.He started his discoveries in this field in 1894 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.They produced a floating chronology of 585 years for Southwestern ruins, and extended Douglass's Flagstaff chronology of Ponderosa Pine, which was 500 years long in 1914, to A. In 1929 Douglass set out on a third Beam Expedition, explicitly targeting samples that would potentially bridge the gap between the two chronologies. Over 15 years after he began working with Clark Wissler, Douglass had bridged the gap and, as a result, had a continuous record of tree-ring data dating back to A. Cliff dwelling at Tsegi Canyon, Mesa Verde, and Canyon de Chelly dated back to the 13th century. He wrote: Its inner rings overlapped the late decades of the old chronology by 49 years, the final ring resting on the year 537 of that sequence; its outer ones overlapped the earliest 120 years of the new, the last one reaching to 1380.Finally, on June 22, 1929, a beam labeled HH-39 was extracted at the Show Low site in Arizona. It was determined that Aztec Ruin was constructed during a period ranging from A. Thus the 26 years from 1260 to 1286, which belonged to both chronologies, were definitely matched and their union confirmed by HH-39, which in American archaeology is destined to hold a place comparable to Egypt's Rosetta Stone…With careful archaeological study we shall perhaps be able to trace the movement of clans and test tribal traditions which have been so often quoted as the early history of these people (Douglass 1929: 770).