The abundance of craters in this region is no coincidence – it reflects the great age of Arabia Terra, which dates back to the Noachian period, around 3.7 to 4.1 billion years ago. That ancient age has also left its mark on the craters themselves. Trouvelot Crater and the one next to it have highly degraded crater rims that appear crumpled and wrinkled due to erosion over time. The rim of the crater next to Trouvelot is barely visible, suggesting that it is the oldest of the four large craters – definitely older than Trouvelot, which formed on top of it. Trouvelot Crater also has a terraced wall, a characteristic feature of complex craters (see annotated image). These terraces form when the crater walls collapse under their own weight, creating step-like structures.