Limestone and sandstone soil

The bedrock of the Roc de Chère is both limestone on the right-hand side of the forest (Talloires side) and sandstone at the foot of the young forest, on the Menthon-Saint-Bernard side.

The Roc de Chère lies along a highly distinctive gap between two geological layers that shape the appearance of the landscape. The Green Lizard and Wild Madder prefer these permeable and hot limestone environments, while Common Heather and ponds are found on sandstone, an acidic and impermeable soil.