Tē-saⁿ-kí (Tertiary period) sī chi̍t tōaⁿ tē-chit sî-tāi, sio̍k-í kū-sek ê hun toāⁿ hong-sek, sî-kan sī 66 kàu 2.58 pah-bān-nî chêng.

Chiàu Kok-chè Tē-chân-ha̍k Úi-oân-hōe (International Commission on Stratigraphy), pún sî-tāi í-keng m̄-sī chèng-sek ê hun tōaⁿ.