[3] In 2009, the cantonal archaeological office of Vaud performed a watching brief excavation, which led to the discovery of a late La Tène period (c. 100 BC) Helvetic cult site with a total of 250 Celtic burial pits containing sacrificial deposits.

Among the deposited goods were ceramic and bronze vessels, iron tools, jewelry, grinding stones, coins, and both animal and human remains.

The flora of Mormont is characterized by a dominance of thermophilic and submediterranean middle-European elements, with a surprising intrusion of mountain species in a site covered with hill vegetation.

As of 2013 with more than 900 species recorded on the site, the Mormont has been considered one of the botanical hotspots of the canton of Vaud, with as a definite advantage the fact that it is still very preserved from invasive plants.

[5] On October 17, 2020, 30-40 environmental activists occupied a zone à défendre (ZAD) on top of the hill above La Birette to protect the ecosystem from destruction.