Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
A relief generation is a set of landforms within a larger landform assembly that can be distinguished by their shape, age, scale and process that created them. A relief generation is typically nested within a larger and older generation and host itself younger and smaller generations. The concept was coined by Julius Büdel in 1955.
References
Bremer, Hanna (2004). "Relief generation". In Goudie, A.S. (ed.). Encyclopedia of Geomorphology. Routledge. pp. 842–843.