Jean-Jacques Jaeger, Vincent Courtillot, Paul Tapponnier; Paleontological view of the ages of the Deccan Traps, the Cretaceous/Tertiary boundary, and the India-Asia collision. Geology ; 17 (4): 316–319. doi: https://doi.org/10.1130/0091-7613(1989)017<0316:PVOTAO>2.3.CO;2
Download citation file:
Volcanism in the Deccan Traps of India occurred over at most three magnetic chrons, centered on a main reversed chron. Paleontological data indicate that this reversed chron must coincide with 29R, which contains the Cretaceous/Tertiary (K/T) boundary. Recent 40Ar-39 Ar data may therefore provide one of the best estimates of the absolute age of the K/T boundary, 65.7 ±2.0 Ma. Moreover, the Eurasian character of K/T boundary terrestrial faunas in India suggests that this was also close to the time of India-Asia collision. This is significantly earlier than generally recognized, and implies about 4000 km of continental shortening in the collision zone, probably absorbed jointly by crustal thickening and strike-slip extrusion.