On one side, entropic processes of decay cause the destruction of cultural traces, on the other, they could contribute to the recovery of memory.
The interesting thing of abandoned places, is the entanglement of cultural and natural storylines through residual materials. The deposits of degraded material may be understood under a diverse interpretative ethic, allowing other-than-human agents to participate in the telling of stories of these so-called decayed locations.
Are decomposition and decay only negative aspects of cultural evolution? I do not think so, and history proves otherwise.