Definition
"Allochthonous" means originating in a place other than where it is found. Think of a river ποΈ carrying sediment from mountains far awayβthat sediment is allochthonous to the river's final location. It emphasizes that something was transported from elsewhere. Unlike something 'autochthonous', an allochthonous element didn't originate locally. Imagine a non-native plant π± in a garden; it came from another region. It's often used in geology, ecology, and geography. The term highlights the importance of movement and transport in shaping environments.