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{
    "pk": 41748,
    "title": "Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A.",
    "subtitle": null,
    "abstract": "Intensive sampling of uppermost Silurian to lowermost Devonian levels of the marine sequence of the Roberts Mountains Formation exposed in the Birch Creek II section, Nevada has yielded assemblages of vertebrate microremains dominated by acanthodian scales. Taxonomic assessment of the vertebrates represented shows a suite and succession of taxa most similar to those recorded from contemporary circum-Arctic assemblages, with scales of the poracanthodid acanthodians \nPoracanthodes punctatus\n, \nP. canadensis\n, \nRadioporacanthodes porosus\n and ischnacanthid \nGomphonchus sandelensis \nmost abundant below the Silurian–Devonian (S–D) boundary (as previously determined by conodont and graptolite occurrences), and stem chondrichthyan ‘acanthodians’ \nNostovicina laticristata\n and other \nNostovicina \nspp. (order, family indet.) the most abundant above the boundary. Just one endemic acanthodian taxon, \nFunicristata nevadaensis\n nov. gen. nov. sp., was found, in the uppermost Silurian. Agnathan vertebrate remains are rare relative to acanthodian scales, with dermal fragments of heterostracans at fewer than 10 levels and scales of thelodonts from 12 levels scattered throughout the whole section. Thelodonts \nApalolepis\n, \nBarlowodus \nspp., ?\nBoreania\n, \nGonioporus alatus,\n \nLanarkia\n,\n Loganellia\n, \nNikolivia\n, \nTalivalia\n, \nThelodus\n, ?\nTurinia\n sp. and \nTrimerolepis \nspp.\n \nare found below the purported S–D boundary. Rare thelodont scales including \nBoreania\n sp. cf. \nminima\n, \nN. gutta\n and a single scale of\n ?Amaltheolepis\n sp. are found above the S–D boundary level. The only identifiable gnathostome remains of groups other than acanthodians are from the putative osteichthyan \nLophosteus\n sp. and chondrichthyans \nEllesmereia schultzei\n and \nPolymerolepis\n sp., in the uppermost Silurian levels.",
    "language": "en",
    "license": {
        "name": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0",
        "short_name": "CC BY-NC-SA 4.0",
        "text": "<p><!-- x-tinymce/html --></p>\n<p>Readers are free to:</p>\n<ul>\n<li><strong>Share</strong> — copy and redistribute the material in any medium or format</li>\n<li><strong>Adapt</strong> — remix, transform, and build upon the material<br><br>The licensor cannot revoke these freedoms as long as you follow the license terms.</li>\n</ul>\n<p>Under the following terms:</p>\n<ul>\n<li><strong>Attribution</strong> — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.</li>\n<li><strong>NonCommercial</strong> — You may not use the material for commercial purposes .</li>\n<li><strong>ShareAlike</strong> — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.<br><br>No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.</li>\n</ul>\n<p>Notices:</p>\n<p>You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.</p>\n<p>No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.</p>",
        "url": "https://creativecommons.org/licenses/by-nc-sa/4.0"
    },
    "keywords": [
        {
            "word": "paleobiogeography, ‘Acanthodii’, Funicristata, Thelodonti, Heterostraci, Chondrichthyes, stem Osteichthyes"
        }
    ],
    "section": "Article",
    "is_remote": true,
    "remote_url": "https://escholarship.org/uc/item/6bb3q574",
    "frozenauthors": [
        {
            "first_name": "Carole",
            "middle_name": "Jan",
            "last_name": "Burrow",
            "name_suffix": "",
            "institution": "Queensland Museum",
            "department": "None"
        },
        {
            "first_name": "Michael",
            "middle_name": "",
            "last_name": "Murphy",
            "name_suffix": "",
            "institution": "University of California Riverside",
            "department": "None"
        },
        {
            "first_name": "Susan",
            "middle_name": "",
            "last_name": "Turner",
            "name_suffix": "",
            "institution": "Queensland Museum",
            "department": "None"
        }
    ],
    "date_submitted": "2021-07-15T04:00:06Z",
    "date_accepted": "2021-07-15T04:00:06Z",
    "date_published": "2023-06-06T19:40:21Z",
    "render_galley": null,
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            "label": "",
            "type": "pdf",
            "path": "https://journalpub.escholarship.org/ucmp_paleobios/article/41748/galley/31219/download/"
        }
    ]
}