TY - RPRT TI - Comparison of the Cretaceous-Tertiary boundary impact events and the 0.77-Ma Australasian tektite event; relevance to mass extinction AU - E.C. Chao PY - 1993 DO - 10.3133/b2050 UR - https://pubs.usgs.gov/publication/b2050 ID - b2050 ER -