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035   $a(CKB)5470000002470695
035   $a(OCoLC)889716049
035   $a(EXLCZ)995470000002470695
100   $a20140901d1993      ua             0
101 0 $aeng
135   $aurn||||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aComparison of the Cretaceous-Tertiary boundary impact events and the 0.77-Ma Australasian tektite event $erelevance to mass extinction /$fby E.C.T. Chao
210  1$a[Washington, D.C.] :$cUnited States Government Printing Office,$d1993.
215   $a1 online resource (iv, 22 pages) $cillustrations, maps
225 1 $aU.S. Geological Survey bulletin ;$v2050
300   $aTitle from title screen (viewed August 25, 2014).
300   $a"Reinterpretation of iridium anomalies, shocked quartz, and microtektites attributed to cratering events in Cretaceous-Tertiaryboundary sections. Evidence from the Ries crater of Germany and Australasian tektites is essential to understanding giant craters and mass extinction."
320   $aIncludes bibliographical references (pages 19-22).
517   $aComparison of the Cretaceous-Tertiary boundary impact events and the 0.77-Ma Australasian tektite event 
606   $aCretaceous-Paleogene boundary
606   $aExtinction (Biology)
606   $aTektite
606   $aCretaceous-Tertiary boundary$2fast
606   $aExtinction (Biology)$2fast
606   $aTektite$2fast
615  0$aCretaceous-Paleogene boundary.
615  0$aExtinction (Biology)
615  0$aTektite.
615  7$aCretaceous-Tertiary boundary.
615  7$aExtinction (Biology)
615  7$aTektite.
700   $aChao$b E. C. T.$01400093
712 02$aGeological Survey (U.S.),
801  0$bCOP
801  1$bCOP
801  2$bOCLCO
801  2$bOCLCF
801  2$bOCLCA
801  2$bGPO
906   $aBOOK
912   $a9910708653103321
996   $aComparison of the Cretaceous-Tertiary boundary impact events and the 0.77-Ma Australasian tektite event$93466390
997   $aUNINA