台北盆地公館地區第四紀松山層中採集之木材，其來源為台北盆地周圍地區。以碳十四同位素定年法定年，其植物體生長年代為全新世中期，時間範圍在4690年 前與5300年前之間。植物所屬類群，由木材解剖特徵鑑定比對結果包括茄苳（大戟科）、紅檜（柏木科）與長葉世界爺（杉科）三個樹種，紅檜為台灣 特有種; 茄苳是廣泛分布在台灣中低海拔的常見植物; 現生的長葉世界爺僅自然分布在北美洲，在台灣為首次發現之物種。由木材生長輪觀察到每隔6-15年有年 輪寬度變寬數年之週期，由春秋材轉變突然，反映季節變化分明。The Woods collected from the Sungshan Formation (Quaternary) of Taipei Basin were drifted from around Taipei Basin. Dated by Carbon 14 method, the Woods were found that they grew in the middle Holocene, i.e. within 4690-5300 years ago. There are three species identified by wood anatomy characters that including Bischofia javanica Bl. (Euphorbiaceae), Chamaecyparis formosensis Matsum. (Cupressaceae) and Sequoia sp. (Taxodiaceae). Bischofia javanica and Chamaecyparis formosensis are the native species in Taiwan. It is the first evidence to find Sequoia distributes in Quaternary of Taiwan. The growth rings in Chamaecyparis and Sequoia show the periodic time that several wider rings followed 6-15 narrow rings. The transfer abrupt from early to late wood reveal the distinct seasons.
