K/T boundary
GEOLOGICAL SIGNATURE, USUALLY A THIN BAND OF ROCK, MARKING THE TRANSITION FROM THE END OF THE CRETACEOUS PERIOD AND THE BEGINNING OF THE PALEOGENE PERIOD, DATED WITH RADIOMETRIC METHODS, AT THE AGE OF 66.043 ± 0.011 MA
K-T boundary; K-T layer; KT boundary; KT Boundary; Kt boundary; C-T boundary; K/T impact; K-T impact; Cretaceous-Paleogene boundary; K-t boundary; K-T Boundary; K–T boundary extinction mechanisms; K–Pg boundary; K-Pg boundary; K-T boundary extinction mechanisms; K/T boundary; K-T Line; K–T boundary; Cretaceous–Tertiary boundary; Cretaceous-Tertiary boundary
¦ noun Geology the boundary between the Cretaceous and Tertiary periods, about 65 million years ago, marked by the extinction of dinosaurs and many other groups of animals.
Origin
from symbols for Cretaceous and Tertiary.