Where does “kerrostuminen” come from?

kerrostuminen (Finnish) comes from Finnish kerrostua, from Finnish kerrostaa, from Finnish kerros, from Finnish kerrata, from Finnish kerta, from Proto-Finnic kerta, from Proto-Indo-European kert-, from Proto-Turkic *keŕ- — to travel, tour.

Ancestry of “kerrostuminen”, step by step

StepLanguageWordMeaning
1FinnishkerrostuaTo be stratified
2Finnishkerrostaato overlay, stratify; to sandwich
3Finnishkerrosfloor, storey; layer; Second-person singular...
4FinnishkerrataTo repeat or reread
5Finnishkertatime, occasion; time; times; also once, when the...
6Proto-Finnickertatime
7Proto-Indo-Europeankert-times; to weave, twist together; time
8Proto-Turkic*keŕ-to travel, tour
Every word from Proto-Turkic *keŕ-Every word from Proto-Indo-European kert-Every word from Proto-Finnic kerta