1986年,在六盘山林区二龙河林场的大南川河滩上发现一棵被大水冲刷露头的埋藏古树,经过1987年8月的挖掘,整个带根树段终于全部出土。这棵古树被我区林史学界陈加良先生编为ⅩⅢ号。由于出土时带有庞大根盘并保留相当数量的树皮,为了区别于其他出土古木,现专称之为ⅩⅢ号土层埋藏古 In 1986, a buried ancient tree washed out by floodwaters was discovered on the Great Nanchuan River beach in the Erlonghe Forest Farm in Liupan Mountains. After excavation in August 1987, the entire rooted tree section was finally unearthed. This ancient tree was edited by Mr. Chen Jialiang, a forestry historian in our district, as ⅩⅢ. As unearthed with a large root disk and retain a considerable amount of bark, in order to distinguish it from other unearthed ancient wood, now called the XIII buried layer of ancient soil