{"id":"https://openalex.org/W1980328862","doi":"https://doi.org/10.1126/science.214.4527.1341","title":"An Iridium Abundance Anomaly at the Palynological Cretaceous-Tertiary Boundary in Northern New Mexico","display_name":"An Iridium Abundance Anomaly at the Palynological Cretaceous-Tertiary Boundary in Northern New Mexico","publication_year":1981,"publication_date":"1981-12-18","ids":{"openalex":"https://openalex.org/W1980328862","doi":"https://doi.org/10.1126/science.214.4527.1341","mag":"1980328862","pmid":"https://pubmed.ncbi.nlm.nih.gov/17812258"},"language":"en","primary_location":{"id":"doi:10.1126/science.214.4527.1341","doi":"https://doi.org/10.1126/science.214.4527.1341","is_oa":false,"landing_page_url":"https://doi.org/10.1126/science.214.4527.1341","pdf_url":null,"source":{"id":"https://openalex.org/S3880285","display_name":"Science","issn_l":"0036-8075","issn":["0036-8075","0193-4511","1095-9203"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-class-a","anvur-scientific","cwts-core","dongbi-a","doyens","erih-plus","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310315823","host_organization_name":"American Association for the Advancement of Science","host_organization_lineage":["https://openalex.org/P4310315823"],"host_organization_lineage_names":["American Association for the Advancement of Science"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Science","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5087776044","display_name":"Charles J. Orth","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1343871089","display_name":"Los Alamos National Laboratory","ror":"https://ror.org/01e41cf67","country_code":"US","type":"facility","lineage":["https://openalex.org/I1330989302","https://openalex.org/I1343871089","https://openalex.org/I198811213","https://openalex.org/I4210120050"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Charles J. Orth","raw_affiliation_strings":["Los Alamos National Laboratory, Los Alamos, New Mexico 87545"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545","institution_ids":["https://openalex.org/I1343871089"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5059273232","display_name":"James S. Gilmore","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1343871089","display_name":"Los Alamos National Laboratory","ror":"https://ror.org/01e41cf67","country_code":"US","type":"facility","lineage":["https://openalex.org/I1330989302","https://openalex.org/I1343871089","https://openalex.org/I198811213","https://openalex.org/I4210120050"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"James S. Gilmore","raw_affiliation_strings":["Los Alamos National Laboratory, Los Alamos, New Mexico 87545"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545","institution_ids":["https://openalex.org/I1343871089"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5035757889","display_name":"Jere D. Knight","orcid":"https://orcid.org/0009-0008-2963-9621","observed_orcids":["https://orcid.org/0009-0008-2963-9621"]},"institutions":[{"id":"https://openalex.org/I1343871089","display_name":"Los Alamos National Laboratory","ror":"https://ror.org/01e41cf67","country_code":"US","type":"facility","lineage":["https://openalex.org/I1330989302","https://openalex.org/I1343871089","https://openalex.org/I198811213","https://openalex.org/I4210120050"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Jere D. Knight","raw_affiliation_strings":["Los Alamos National Laboratory, Los Alamos, New Mexico 87545"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Los Alamos National Laboratory, Los Alamos, New Mexico 87545","institution_ids":["https://openalex.org/I1343871089"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5047003321","display_name":"Charles L. Pillmore","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1286329397","display_name":"United States Geological Survey","ror":"https://ror.org/035a68863","country_code":"US","type":"government","lineage":["https://openalex.org/I1286329397","https://openalex.org/I1335927249"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Charles L. Pillmore","raw_affiliation_strings":["U.S. Geological Survey, Denver, Colorado 80225"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"U.S. Geological Survey, Denver, Colorado 80225","institution_ids":["https://openalex.org/I1286329397"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5064160546","display_name":"Robert H. Tschudy","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1286329397","display_name":"United States Geological Survey","ror":"https://ror.org/035a68863","country_code":"US","type":"government","lineage":["https://openalex.org/I1286329397","https://openalex.org/I1335927249"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Robert H. Tschudy","raw_affiliation_strings":["U.S. Geological Survey, Denver, Colorado 80225"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"U.S. Geological Survey, Denver, Colorado 80225","institution_ids":["https://openalex.org/I1286329397"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5018868868","display_name":"James E. Fassett","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1286329397","display_name":"United States Geological Survey","ror":"https://ror.org/035a68863","country_code":"US","type":"government","lineage":["https://openalex.org/I1286329397","https://openalex.org/I1335927249"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"James E. Fassett","raw_affiliation_strings":["U.S. Geological Survey, Albuquerque, New Mexico 87125"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"U.S. Geological Survey, Albuquerque, New Mexico 87125","institution_ids":["https://openalex.org/I1286329397"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":11.126,"has_fulltext":false,"cited_by_count":147,"citation_normalized_percentile":{"value":0.98782138,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":87,"max":98},"biblio":{"volume":"214","issue":"4527","first_page":"1341","last_page":"1343"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10109","display_name":"Paleontology and Stratigraphy of Fossils","score":0.9413999915122986,"subfield":{"id":"https://openalex.org/subfields/1911","display_name":"Paleontology"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10109","display_name":"Paleontology and Stratigraphy of Fossils","score":0.9413999915122986,"subfield":{"id":"https://openalex.org/subfields/1911","display_name":"Paleontology"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10325","display_name":"Astro and Planetary Science","score":0.04839999973773956,"subfield":{"id":"https://openalex.org/subfields/1912","display_name":"Space and Planetary Science"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10955","display_name":"Paleontology and Evolutionary Biology","score":0.0017999999690800905,"subfield":{"id":"https://openalex.org/subfields/1911","display_name":"Paleontology"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/iridium-anomaly","display_name":"iridium anomaly","score":0.9020000100135803},{"id":"https://openalex.org/keywords/cretaceous-paleogene-boundary","display_name":"Cretaceous-Paleogene boundary","score":0.9829999804496765},{"id":"https://openalex.org/keywords/palynology","display_name":"palynology","score":0.722000002861023},{"id":"https://openalex.org/keywords/raton-basin","display_name":"Raton Basin","score":0.6430000066757202},{"id":"https://openalex.org/keywords/coal-seams","display_name":"coal seams","score":0.6000000238418579},{"id":"https://openalex.org/keywords/mass-extinction","display_name":"mass extinction","score":0.6039999723434448}],"concepts":[{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.7725262641906738},{"id":"https://openalex.org/C12294951","wikidata":"https://www.wikidata.org/wiki/Q44626","display_name":"Cretaceous","level":2,"score":0.7251545190811157},{"id":"https://openalex.org/C162501224","wikidata":"https://www.wikidata.org/wiki/Q212919","display_name":"Palynology","level":3,"score":0.6627354621887207},{"id":"https://openalex.org/C6494504","wikidata":"https://www.wikidata.org/wiki/Q82480","display_name":"Sedimentary rock","level":2,"score":0.6316020488739014},{"id":"https://openalex.org/C151730666","wikidata":"https://www.wikidata.org/wiki/Q7205","display_name":"Paleontology","level":1,"score":0.5858945250511169},{"id":"https://openalex.org/C77077793","wikidata":"https://www.wikidata.org/wiki/Q336019","display_name":"Abundance (ecology)","level":2,"score":0.5473763942718506},{"id":"https://openalex.org/C12997251","wikidata":"https://www.wikidata.org/wiki/Q567560","display_name":"Anomaly (physics)","level":2,"score":0.4993712902069092},{"id":"https://openalex.org/C109007969","wikidata":"https://www.wikidata.org/wiki/Q749565","display_name":"Structural basin","level":2,"score":0.41583722829818726},{"id":"https://openalex.org/C2780618852","wikidata":"https://www.wikidata.org/wiki/Q79932","display_name":"Pollen","level":2,"score":0.3975057601928711},{"id":"https://openalex.org/C17409809","wikidata":"https://www.wikidata.org/wiki/Q161764","display_name":"Geochemistry","level":1,"score":0.3260176181793213},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.11095321178436279},{"id":"https://openalex.org/C26873012","wikidata":"https://www.wikidata.org/wiki/Q214781","display_name":"Condensed matter physics","level":1,"score":0.0},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.0},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1126/science.214.4527.1341","doi":"https://doi.org/10.1126/science.214.4527.1341","is_oa":false,"landing_page_url":"https://doi.org/10.1126/science.214.4527.1341","pdf_url":null,"source":{"id":"https://openalex.org/S3880285","display_name":"Science","issn_l":"0036-8075","issn":["0036-8075","0193-4511","1095-9203"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-class-a","anvur-scientific","cwts-core","dongbi-a","doyens","erih-plus","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310315823","host_organization_name":"American Association for the Advancement of Science","host_organization_lineage":["https://openalex.org/P4310315823"],"host_organization_lineage_names":["American Association for the Advancement of Science"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Science","raw_type":"journal-article"},{"id":"pmid:17812258","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/17812258","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Science (New York, N.Y.)","raw_type":"Journal Article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":5,"referenced_works":["https://openalex.org/W1508632178","https://openalex.org/W1863017920","https://openalex.org/W1982572431","https://openalex.org/W2011916250","https://openalex.org/W2110619496"],"related_works":["https://openalex.org/W1847538392","https://openalex.org/W2033629863","https://openalex.org/W4293783520","https://openalex.org/W2025739858","https://openalex.org/W2013795681","https://openalex.org/W1970083031","https://openalex.org/W2048913371","https://openalex.org/W2086117179","https://openalex.org/W2095688665","https://openalex.org/W1894272292"],"abstract_inverted_index":{"An":[0],"iridium":[1],"abundance":[2],"anomaly,":[3],"with":[4],"concentrations":[5],"up":[6],"to":[7,18],"5000":[8],"parts":[9,20],"per":[10,21],"trillion":[11],"over":[12],"a":[13,50],"background":[14],"level":[15],"of":[16,39,49,63],"4":[17],"20":[19],"trillion,":[22],"has":[23],"been":[24],"located":[25],"in":[26,35],"sedimentary":[27],"rocks":[28],"laid":[29],"down":[30],"under":[31],"freshwater":[32],"swamp":[33],"conditions":[34],"the":[36,47,54],"Raton":[37],"Basin":[38],"northeastern":[40],"New":[41],"Mexico.":[42],"The":[43],"anomaly":[44],"occurs":[45],"at":[46,53,58],"base":[48],"coal":[51],"bed,":[52],"same":[55],"stratigraphic":[56],"position":[57],"which":[59],"several":[60],"well-known":[61],"species":[62],"Cretaceous-age":[64],"pollen":[65],"became":[66],"extinct.":[67]},"counts_by_year":[{"year":2026,"cited_by_count":5},{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":4},{"year":2023,"cited_by_count":2},{"year":2022,"cited_by_count":4},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":2},{"year":2017,"cited_by_count":3},{"year":2016,"cited_by_count":1},{"year":2015,"cited_by_count":2},{"year":2014,"cited_by_count":2},{"year":2013,"cited_by_count":2},{"year":2012,"cited_by_count":2}],"updated_date":"2026-11-07T11:25:07.637180","created_date":"2016-06-24T00:00:00"}
