ケイティーきょうかい K-T境界 LinksSentence search for K-T境界Sentence search for ケイティーきょうかいSentence search for KT境界Kanji details for 境 and 界Edit in JMdict Noun1. K-T boundary (between the Cretaceous period and the Tertiary period)GeologyOther formsKT境界 【ケイティーきょうかい】 Discussions Log in to talk about this word.