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Although the two trilobite-brachiopod extinction boundaries could be assigned to \u00b14 millimeters of vertical section by laboratory examination of the rocks, only background amounts of iridium (2 \u00d7 10\n            <jats:sup>-12<\/jats:sup>\n            to 17 \u00d7 10\n            <jats:sup>-12<\/jats:sup>\n            gram per gram of whole rock) were observed.\n          <\/jats:p>","DOI":"10.1126\/science.223.4632.163","type":"journal-article","created":{"date-parts":[[2006,10,5]],"date-time":"2006-10-05T19:41:59Z","timestamp":1160077319000},"page":"163-165","source":"Crossref","is-referenced-by-count":15,"title":["A Search for Iridium Abundance Anomalies at Two Late Cambrian Biomere Boundaries in Western Utah"],"prefix":"10.1126","volume":"223","author":[{"given":"Charles J.","family":"Orth","sequence":"first","affiliation":[{"name":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jere D.","family":"Knight","sequence":"additional","affiliation":[{"name":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Leonard R.","family":"Quintana","sequence":"additional","affiliation":[{"name":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James S.","family":"Gilmore","sequence":"additional","affiliation":[{"name":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Allison R.","family":"Palmer","sequence":"additional","affiliation":[{"name":"Geological Society of America, Boulder, Colorado 80301"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"221","reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.208.4448.1095"},{"key":"e_1_2_1_2_1","first-page":"734","volume":"60","year":"1979","unstructured":"ALVAREZ, W, EOS, TRANSACTIONS AMERICAN GEOPHYSICAL UNION 60: 734 (1979).","journal-title":"EOS, TRANSACTIONS AMERICAN GEOPHYSICAL UNION"},{"key":"e_1_2_1_3_1","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1130\/SPE190-p305","volume":"190","year":"1982","unstructured":"ALVAREZ, W, GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPERS 190: 305 (1982).","journal-title":"GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPERS"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.216.4548.886"},{"key":"e_1_2_1_5_1","doi-asserted-by":"crossref","first-page":"517","DOI":"10.1130\/SPE190-p517","volume":"190","year":"1982","unstructured":"ASARO, F, GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPERS 190: 517 (1982).","journal-title":"GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPERS"},{"key":"e_1_2_1_6_1","first-page":"26","volume":"68","year":"1980","unstructured":"BAMBACH, R.K., BEFORE PANGEA - GEOGRAPHIES OF THE PALEOZOIC WORLD, AMERICAN SCIENTIST 68: 26 (1980).","journal-title":"AMERICAN SCIENTIST"},{"key":"e_1_2_1_7_1","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1016\/0012-821X(81)90055-8","volume":"54","year":"1981","unstructured":"GANAPATHY, R, IRIDIUM ANOMALY AT THE CRETACEOUS-TERTIARY BOUNDARY IN TEXAS, EARTH AND PLANETARY SCIENCE LETTERS 54: 393 (1981).","journal-title":"EARTH AND PLANETARY SCIENCE LETTERS"},{"key":"e_1_2_1_8_1","doi-asserted-by":"crossref","first-page":"513","DOI":"10.1130\/SPE190-p513","volume":"190","year":"1982","unstructured":"GANAPATHY, R, GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPERS 190: 513 (1982).","journal-title":"GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPERS"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.209.4459.921"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.216.4548.885"},{"key":"e_1_2_1_11_1","doi-asserted-by":"crossref","first-page":"224","DOI":"10.1038\/307224a0","volume":"307","year":"1984","unstructured":"Gilmore, J. 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