Science. 1964 Mar 13;143(3611):1171-3. doi: 10.1126/science.143.3611.1171.
Leafy twigs and seeds of juniper are abundant in nine ancient Neotoma middens discovered in low, arid, desert ranges devoid of junipers, near Frenchman Flat, Nevada. Existing vegetation is creosote bush and other desert shrubs. Twelve radiocarbon dates suggest that the middens were deposited between 7800 to more than 40,000 years ago. Dominance of Utah juniper and absence of pinyon pine in most deposits indicates a local Pleistocene woodland climate more arid than the usual pinyon-juniper climate.
在位于内华达州弗伦奇曼平地附近、干旱的低海拔沙漠山脉中发现了 9 个古老的新墨西哥囊鼠（Neotoma）洞穴，其中有丰富的杜松叶和种子。现有的植被是苦艾灌木和其他沙漠灌木。12 个放射性碳测年表明，这些洞穴沉积物的年代在 7800 年至 4 万多年前之间。犹他州杜松的优势和大多数沉积物中没有松的存在表明，当地的更新世林地气候比通常的松柏气候更干燥。
