01303nas a2200169   4500008004100000245007500041210007000116300001200186490000700198520075700205653003800962100002101000700002101021700002001042700002001062856005101082       1991                        eng d00aChronology of Holocene Vertebrate Extinction in the Galápagos Islands0 aChronology of Holocene Vertebrate Extinction in the Galápagos Is  a126-1330 v363 a<div>Eleven conventional and 15 AMS (accelerator mass spectrometer) radiocarbon dates establish chronologies for nine Holocene vertebrate fossil sites in the Galápagos Islands, Ecuador. A Holocene fossil record approaching 500,000 bones, more than 90% of which predate the arrival of people, shows that most or all cases of extinction or extirpation in the Galápagos occurred after first human contact in AD 1535. This is especially significant for two species of large rodents (<em>Megaoryzomys</em> spp.) that are known only from bones found in lava tubes. The highest rate of background (prehuman) extinction interpreted from the Galápagos fossil record is probably hundreds of times less than the modern rate of human-related extinction.</div>
10aanthropology biology paleontology1 aSteadman, D., W.1 aStafford, T., W.1 aDonahue, D., J.1 aJull, A., J. T.  uhttp://dx.doi.org/10.1016/0033-5894(91)90021-V