Messel

Messel Pit, a UNESCO World Heritage Site near Frankfurt am Main, Germany, offers unparalleled insights into a terrestrial ecosystem from Earth's last greenhouse climate phase during the Eocene, approximately 48 million years ago. This site preserves an extraordinary range of fossils—from algae to plants and animals—with remarkable detail, including iridescent insect coloration, bird plumage, reptile scales, and even organismic interactions such as predator-prey relations and reproductive behavior. The exceptional soft-tissue preservation at Messel is attributed to its oil shale sediment, which has a high water and organic content, enabling long-term conservation of vertebrate fossils through specialized transfer methods developed in the mid-20th century. Messel's species diversity in many groups surpasses that of similar areas today, making it a critical site for understanding life during a greenhouse climate.

Smith, K. T. (2021). Messel. Encyclopedia of Life Sciences, 1–7. Portico. https://doi.org/10.1002/9780470015902.a0029377