Terrestrial Impact Structures ADS Classic is now deprecated. It will be completely retired in October
2019. This page will automatically redirect to the new ADS interface at that point. SAO/NASA …

If at least some mass extinctions are caused by impacts, why do they extend over intervals of
one to three million years and have a partly stepwise character? The solution may be …

▪ Abstract A large extraterrestrial object striking Earth at cosmic velocity melts and vaporizes
silicate materials, which can condense into highly spheroidal, sand-size particles that get …

Tektites are generally small, black, rounded, silicate glass bodies found scattered over
several widely separated areas of the Earth's surface called strewn fields. Four major tektite …

IT has long been known that impact between rocky bodies at velocities of≳ 15 km s− 1 can
melt or vaporize both the impacting object and a portion of the target1. We have recently …

"... bangs have replaced whimpers and the geological record has become much more
exciting than it was thought to be." Derek Ager (1993) The New Catastro phism. Cambridge …

Iridium measured in 149 samples of a continuous 9-meter section of Pacific abyssal clay
covering the time span 33 to 67 million years ago shows a well-defined peak only at the …

Abstract At Ocean Drilling Program Site 689 (Maud Rise, Southern Ocean), δ18O records of
fine-fraction bulk carbonate and benthic foraminifers indicate that accelerated climate …

Five major planktonic and benthic foraminiferal extinction events occurred during the past
100 my: at the Cenomanian/Turonian (CT) boundary, at the Cretaceous/Tertiary (KT) …

Nearly 57% of marine invertebrate families died out when the biggest mass extinction of the
Phanerozoic took place at the Permo-Triassic (P/T) boundary. The lithologic change across …