In November of 1981, another expedition, which included an American adviser for the National Park division, discovered more trail remains. The American adviser recognized the pattern to be similar to the inlay pattern of trails laid in California by Chinese laborers during the construction of rail lines in the late 19th century.
陳仲玉回憶說：「後來我們會同國家公園的美籍顧問羅瑞麟勘查原址，他注意到這些『人』字形的砌牆手法，在美國加州的山區步道中也出現過。如此看來，或許是出自十九世紀在美華工的手藝。」