Science. 1966 Sep 2;153(3740):1133-5. doi: 10.1126/science.153.3740.1133.
The most abundant free fatty acids present in a sample of shale from the Green River Formation (Eocene, about 60 x 10(6) years) from Sulfur Creek are the acylic C(19) and C(20) isoprenoid acids. The dominance of these acids parallels the abundance of the corresponding hydrocarbons pristane and phytane.
从硫磺溪（Eocene，约 60 x 10(6) 年）绿河组页岩样本中存在的最丰富的游离脂肪酸是 acylic C(19) 和 C(20) 异戊二烯酸。这些酸的优势与相应烃类姥鲛烷和植烷的丰度相吻合。
