Relative spore and pollen abundances from open-cast lignite mine Helmstedt

Tropical climates reached their northernmost expansion during the early Paleogene greenhouse phase, supporting a paratropical biota as far north as the southern shore of the...在古近纪（Paleogene）早期温室期，热带气候达到了其最北的扩张边界，彼时副热带生物群（paratropical biota）的分布北界可延伸至……的南岸地带。