{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T22:42:09Z","timestamp":1768344129152,"version":"3.49.0"},"reference-count":91,"publisher":"Geological Society of London","issue":"2","license":[{"start":{"date-parts":[[2020,10,13]],"date-time":"2020-10-13T00:00:00Z","timestamp":1602547200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["SJG"],"published-print":{"date-parts":[[2020,11]]},"abstract":"<jats:p>\n            The paucity of ammonite recovery from North Sea wells has meant that offshore correlations are largely dependent upon microfossil assemblages. While rare, ammonites have been found in a few boreholes during the course of oil exploration activities. The occurrence of ammonites in ten wells in the UK sector of the Viking Graben and the Moray Firth rift arms provides a new basis by which to demonstrate that there was a distinct separation between Arctic and sub-Mediterranean species that lasted from Bajocian to Early Callovian times. Five wells contain \u2018Boreal Bathonian' ammonites from the Arctic Realm.\n            <jats:italic>Arctocephalites<\/jats:italic>\n            from the Boreal Arcticus Zone (uppermost Bajocian) correlates basinal partly anoxic mudstones in the Beryl Embayment (9\/13b) with both bioturbated siltstones in the southern Viking Graben (9\/10b), and calcareous mudstones in the East Shetland Basin (211\/21). Upper Bajocian Pompeckji Zone\n            <jats:italic>Cranocephalites<\/jats:italic>\n            and younger\n            <jats:italic>Arcticoceras<\/jats:italic>\n            from Lower to Middle Bathonian Greenlandicus, Ishmae and Cranocephaloide zones are confined to 211\/21 demonstrating that the marine transgression began earlier and lasted longer. A\n            <jats:italic>Cadoceras<\/jats:italic>\n            from well 3\/3-8 dates to the Lower Callovian Koenigi and Calloviense zones during which renewed extensional faulting re-established ammonite migration routes between the Boreal and sub-Mediterranean realms. A Middle Oxfordian (Densiplicatum Zone)\n            <jats:italic>Perisphinctes<\/jats:italic>\n            from well 22\/5b-8 confirms an episode of northward migration from the sub-Mediterranean into the Boreal Realm. Upper Oxfordian (Regulare to Rosenkantzi zones)\n            <jats:italic>Amoeboceras<\/jats:italic>\n            in wells 211\/21-1 and 9\/13b-19 are close to Upper Bajocian\/Lower Bathonian faunas, suggesting an absence of Upper Bathonian to Middle Oxfordian strata as a result of rift-related footwall uplift and erosion. In four wells from Block 15\/21 (-4, -11, -12A and -25) Lower Kimmeridgian ammonites have been documented, including\n            <jats:italic>Rasenia<\/jats:italic>\n            ,\n            <jats:italic>Amoebites<\/jats:italic>\n            ,\n            <jats:italic>Aulacostephanoides<\/jats:italic>\n            and\n            <jats:italic>Zenostephanoides<\/jats:italic>\n            , from the Baylei (?), Cymodoce, Mutabilis and Eudoxus zones, the latter (confirmed at well 13\/28b-8) dating a widespread regional marine flooding surface in the Inner Moray Firth.\n          <\/jats:p>\n          <jats:p content-type=\"supplementary-material\">\n            <jats:bold>Supplementary material:<\/jats:bold>\n            The detailed measurements of dimensions of the ammonites described are available at:\n            <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" specific-use=\"dataset is-supplemented-by\" xlink:href=\"https:\/\/doi.org\/10.6084\/m9.figshare.c.5087313\">https:\/\/doi.org\/10.6084\/m9.figshare.c.5087313<\/jats:ext-link>\n          <\/jats:p>","DOI":"10.1144\/sjg2019-030","type":"journal-article","created":{"date-parts":[[2020,8,14]],"date-time":"2020-08-14T20:05:28Z","timestamp":1597435528000},"page":"175-195","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["Ammonite occurrences in North Sea cores: implications for Jurassic Arctic\u2013Mediterranean marine seaway connectivity"],"prefix":"10.1144","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0212-8457","authenticated-orcid":false,"given":"Nicol","family":"Morton","sequence":"first","affiliation":[{"name":"Le Chardon, 180 Chemin Brugi\u00e8re, 07200 Vog\u00fc\u00e9, France"},{"name":"formerly Birkbeck College, London"}]},{"given":"Vasily V.","family":"Mitta","sequence":"additional","affiliation":[{"name":"Borissiak Paleontological Institute, Russian Academy of Science, Profsoyuznaya 123, Moscow, 117997, Russia"},{"name":"Cherepovets State University, Lunacharskkogo 5, Cheropovets, 162600, Russia"}]},{"given":"John R.","family":"Underhill","sequence":"additional","affiliation":[{"name":"Centre for Exploration Geoscience, Institute of GeoEnergy Engineering (IGE), Heriot-Watt University, Edinburgh EH14 4AS, UK"}]}],"member":"1881","published-online":{"date-parts":[[2020,10,13]]},"reference":[{"key":"e_1_3_6_2_1","doi-asserted-by":"crossref","unstructured":"Alsen P. and Surlyk F. 2004. 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