00486naa#a2200157#i#450# EN\\bibl\46976 20260313221528.5 1681-1208 20081225b2008####ek#y0engy0150####ca RU Metallic iron in sediments at the Mesozoic-Cenozoic K/T boundary Journal article Moscow Geophysical Center of the Russian Academy of Sciences 2008 8 с. Journal article local Pechersky D M ras.editorum.ru