Science. 1982 Sep 17;217(4565):1142-5. doi: 10.1126/science.217.4565.1142.
Fossil assemblages from 53 packrat middens indicate which plant species were dominant during the last 24,000 years in the eastern Grand Canyon. Past vegetational patterns show associations that cannot be attributed to simple elevational displacement of the modern zones. A model emphasizing a latitudinal shift of climatic values is proposed.
来自 53 个囊鼠 midden 的化石组合表明,在过去的 24000 年里,大峡谷东部哪种植物占主导地位。过去的植被模式显示出的关联不能简单地归因于现代地带的海拔位移。本文提出了一个强调气候值纬度转移的模型。