{"id":"https://openalex.org/W1964354440","doi":"https://doi.org/10.1139/e67-044","title":"MASTODONS, THEIR GEOLOGIC AGE AND EXTINCTION IN ONTARIO, CANADA","display_name":"MASTODONS, THEIR GEOLOGIC AGE AND EXTINCTION IN ONTARIO, CANADA","publication_year":1967,"publication_date":"1967-08-01","ids":{"openalex":"https://openalex.org/W1964354440","doi":"https://doi.org/10.1139/e67-044","mag":"1964354440"},"language":"en","primary_location":{"id":"doi:10.1139/e67-044","doi":"https://doi.org/10.1139/e67-044","is_oa":false,"landing_page_url":"https://doi.org/10.1139/e67-044","pdf_url":null,"source":{"id":"https://openalex.org/S4305354","display_name":"Canadian Journal of Earth Sciences","issn_l":"0008-4077","issn":["0008-4077","1480-3313"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","dongbi-c","jufo-1","norway-1","poland-70","russia-white-list-2"],"host_organization":"https://openalex.org/P4310312929","host_organization_name":"Canadian Science Publishing","host_organization_lineage":["https://openalex.org/P4310312929"],"host_organization_lineage_names":["Canadian Science Publishing"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Canadian Journal of Earth Sciences","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["crossref"],"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/A5012334337","display_name":"Aleksis Dreimanis","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"A. Dreimanis","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":["https://openalex.org/A5012334337"],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":6.2483,"has_fulltext":false,"cited_by_count":26,"citation_normalized_percentile":{"value":0.9232568,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":95},"biblio":{"volume":"4","issue":"4","first_page":"663","last_page":"675"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10421","display_name":"Pleistocene-Era Hominins and Archaeology","score":0.7279999852180481,"subfield":{"id":"https://openalex.org/subfields/3314","display_name":"Anthropology"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},"topics":[{"id":"https://openalex.org/T10421","display_name":"Pleistocene-Era Hominins and Archaeology","score":0.7279999852180481,"subfield":{"id":"https://openalex.org/subfields/3314","display_name":"Anthropology"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},{"id":"https://openalex.org/T11354","display_name":"Evolution and Paleontology Studies","score":0.23489999771118164,"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/T10017","display_name":"Geology and Paleoclimatology Research","score":0.017899999395012856,"subfield":{"id":"https://openalex.org/subfields/1902","display_name":"Atmospheric 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"}}],"keywords":[{"id":"https://openalex.org/keywords/mastodon","display_name":"Mastodon","score":0.9520000219345093},{"id":"https://openalex.org/keywords/pleistocene-megafauna","display_name":"Pleistocene megafauna","score":0.7829999923706055},{"id":"https://openalex.org/keywords/extinction","display_name":"extinction","score":0.6480000019073486},{"id":"https://openalex.org/keywords/wisconsin-glaciation","display_name":"Wisconsin glaciation","score":0.6510000228881836},{"id":"https://openalex.org/keywords/postglacial-climate-change","display_name":"postglacial climate change","score":0.8059999942779541},{"id":"https://openalex.org/keywords/spruce-forest","display_name":"spruce forest","score":0.8389999866485596},{"id":"https://openalex.org/keywords/lacustrine-plain","display_name":"lacustrine plain","score":0.6169999837875366},{"id":"https://openalex.org/keywords/great-lakes","display_name":"Great Lakes","score":0.47699999809265137},{"id":"https://openalex.org/keywords/radiocarbon-dating","display_name":"radiocarbon dating","score":0.7379999756813049},{"id":"https://openalex.org/keywords/ontario","display_name":"Ontario","score":0.3440000116825104}],"concepts":[{"id":"https://openalex.org/C203174812","wikidata":"https://www.wikidata.org/wiki/Q3241565","display_name":"Woodland","level":2,"score":0.6773055791854858},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.654552161693573},{"id":"https://openalex.org/C100537666","wikidata":"https://www.wikidata.org/wiki/Q893477","display_name":"Boreal","level":2,"score":0.6023126840591431},{"id":"https://openalex.org/C100134115","wikidata":"https://www.wikidata.org/wiki/Q173412","display_name":"Radiocarbon dating","level":2,"score":0.5784823298454285},{"id":"https://openalex.org/C2780618852","wikidata":"https://www.wikidata.org/wiki/Q79932","display_name":"Pollen","level":2,"score":0.511410653591156},{"id":"https://openalex.org/C87621631","wikidata":"https://www.wikidata.org/wiki/Q69564","display_name":"Taiga","level":2,"score":0.4895535409450531},{"id":"https://openalex.org/C65814071","wikidata":"https://www.wikidata.org/wiki/Q1787265","display_name":"Stadial","level":3,"score":0.4884587824344635},{"id":"https://openalex.org/C25868968","wikidata":"https://www.wikidata.org/wiki/Q1163945","display_name":"Macrofossil","level":3,"score":0.4846287667751312},{"id":"https://openalex.org/C101991246","wikidata":"https://www.wikidata.org/wiki/Q5422078","display_name":"Extinction (optical mineralogy)","level":2,"score":0.48410022258758545},{"id":"https://openalex.org/C100970517","wikidata":"https://www.wikidata.org/wiki/Q52107","display_name":"Physical geography","level":1,"score":0.48317137360572815},{"id":"https://openalex.org/C162501224","wikidata":"https://www.wikidata.org/wiki/Q212919","display_name":"Palynology","level":3,"score":0.4234110116958618},{"id":"https://openalex.org/C97137747","wikidata":"https://www.wikidata.org/wiki/Q38112","display_name":"Forestry","level":1,"score":0.4028901159763336},{"id":"https://openalex.org/C15739521","wikidata":"https://www.wikidata.org/wiki/Q602963","display_name":"Glacial period","level":2,"score":0.3815906047821045},{"id":"https://openalex.org/C166957645","wikidata":"https://www.wikidata.org/wiki/Q23498","display_name":"Archaeology","level":1,"score":0.3325516879558563},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.2824280858039856},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.264532208442688},{"id":"https://openalex.org/C151730666","wikidata":"https://www.wikidata.org/wiki/Q7205","display_name":"Paleontology","level":1,"score":0.2630682587623596},{"id":"https://openalex.org/C140345934","wikidata":"https://www.wikidata.org/wiki/Q25445","display_name":"Holocene","level":2,"score":0.21371644735336304},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1139/e67-044","doi":"https://doi.org/10.1139/e67-044","is_oa":false,"landing_page_url":"https://doi.org/10.1139/e67-044","pdf_url":null,"source":{"id":"https://openalex.org/S4305354","display_name":"Canadian Journal of Earth Sciences","issn_l":"0008-4077","issn":["0008-4077","1480-3313"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","dongbi-c","jufo-1","norway-1","poland-70","russia-white-list-2"],"host_organization":"https://openalex.org/P4310312929","host_organization_name":"Canadian Science Publishing","host_organization_lineage":["https://openalex.org/P4310312929"],"host_organization_lineage_names":["Canadian Science Publishing"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Canadian Journal of Earth Sciences","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"sustainable_development_goals_aurora":[{"display_name":"Life below water","score":0.5699999928474426,"id":"https://metadata.un.org/sdg/14"}],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":20,"referenced_works":["https://openalex.org/W616131214","https://openalex.org/W794261434","https://openalex.org/W1966833794","https://openalex.org/W1980944046","https://openalex.org/W1999686903","https://openalex.org/W2010717489","https://openalex.org/W2017847424","https://openalex.org/W2023395076","https://openalex.org/W2102414009","https://openalex.org/W2263868678","https://openalex.org/W2298950124","https://openalex.org/W2324904920","https://openalex.org/W2473733230","https://openalex.org/W2491116618","https://openalex.org/W2555070629","https://openalex.org/W2555756052","https://openalex.org/W2783141957","https://openalex.org/W4213127497","https://openalex.org/W4244169095","https://openalex.org/W4254849957"],"related_works":["https://openalex.org/W2284593682","https://openalex.org/W7095465942","https://openalex.org/W1529425401","https://openalex.org/W2066406638","https://openalex.org/W1720385906","https://openalex.org/W2007364216","https://openalex.org/W3154203200","https://openalex.org/W2069120805","https://openalex.org/W2902455279","https://openalex.org/W2336486574"],"abstract_inverted_index":{"Most":[0],"Canadian":[1],"occurrences":[2,54],"of":[3,11,47,65,73,98,107,125,130,157,172],"mastodons":[4,41,74,90,99,180],"are":[5],"from":[6,116,151],"southern":[7,173],"Ontario.":[8,174],"About":[9],"four-fifths":[10],"them":[12,152],"have":[13,101],"been":[14,102],"found":[15],"below":[16],"Lake":[17],"Warren":[18],"shore,":[19],"thus":[20],"being":[21,149],"younger":[22],"than":[23],"12":[24],"400":[25],"years":[26,37],"B.P.;":[27],"the":[28,45,48,58,76,82,133,144,167,191],"youngest":[29],"radiocarbon":[30],"date":[31],"is":[32],"8":[33],"910":[34],"\u00b1":[35],"150":[36],"B.P.":[38],"Though":[39],"most":[40],"entered":[42],"Ontario":[43],"after":[44],"retreat":[46],"Wisconsin":[49,62],"ice":[50],"sheet,":[51],"a":[52,154],"few":[53],"may":[55],"belong":[56],"to":[57,120,143,184,190],"Mid-":[59],"and":[60,71,84,111,123,128,159,186],"Early":[61],"interstadials.":[63],"Association":[64],"spruce":[66,92,109,147],"pollen":[67],"with":[68],"mastodon":[69],"bones":[70],"concentration":[72],"in":[75],"poorly":[77],"drained":[78,169],"lacustrine":[79],"plains":[80],"during":[81],"late-glacial":[83],"early":[85],"postglacial":[86,126],"time":[87],"suggest":[88],"that":[89],"preferred":[91],"forests":[93],"or":[94],"woodlands.":[95],"The":[96],"extinction":[97],"might":[100],"initiated":[103],"by":[104,113,153,176],"gradual":[105],"shrinking":[106],"these":[108],"forests,":[110,148,161],"completed":[112],"their":[114,141],"disappearance":[115],"southwestern":[117],"Ontario,":[118],"owing":[119],"increasing":[121],"warmth":[122],"dryness":[124],"climate,":[127],"improvement":[129],"drainage":[131],"along":[132],"lowered":[134],"Great":[135],"Lakes.":[136],"Mastodons":[137],"did":[138],"not":[139],"find":[140],"way":[142],"northern":[145],"boreal":[146],"separated":[150],"wide":[155],"belt":[156],"pine":[158],"hardwood":[160],"which":[162],"meanwhile":[163],"had":[164],"developed":[165],"over":[166],"better":[168],"morainic":[170],"areas":[171],"Weakened":[175],"less":[177],"suitable":[178],"food,":[179],"became":[181],"more":[182],"sensitive":[183],"diseases":[185],"an":[187],"easier":[188],"prey":[189],"Paleoindians.":[192]},"counts_by_year":[{"year":2024,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":2},{"year":2017,"cited_by_count":1},{"year":2016,"cited_by_count":1},{"year":2013,"cited_by_count":1},{"year":2012,"cited_by_count":1}],"updated_date":"2026-10-31T12:09:11.096373","created_date":"2016-06-24T00:00:00"}
