Science. 1977 Aug 19;197(4305):765-7. doi: 10.1126/science.197.4305.765.
Organic solvent extractions of green-colored fossil Celtis sp. and Ulmus sp. leaves (36 to 25 x 10(6) years old) indicate the preservation of quercetin-3-O-glycosides, apigenin and luteolin carbon glycosides, methyl pheophorbide a, and a consortium of other organic constituents. Comparisons between referable fossil and extant taxa indicate a high level of phytochemical fidelity. The preservation of O-glycosides indicates a mild postdepositional environment during fossilization.
绿色化石 Celtis sp. 和 Ulmus sp. 叶片（36 到 25 x 10^6 年）的有机溶剂提取表明槲皮素-3-O-糖苷、芹菜素和木犀草素碳糖苷、甲基脱镁叶绿酸 a 以及其他有机成分的混合物得以保存。可参照的化石和现存分类群之间的比较表明植物化学物质具有高度的保真度。O-糖苷的保存表明在化石形成过程中存在温和的后生环境。
