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{
    "pk": 41780,
    "title": "Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs",
    "subtitle": null,
    "abstract": "Systematic documentation of pteriomorph bivalves of the late Eocene–early Oligocene Keasey Formation in western Oregon follows previous monographic treatments of the anomalodesmatans and heteroconchs. It includes material from coeval Cascadia Margin strata in southwestern Washington in the context of major molluscan faunal turnover during the dramatic doubthouse climate transition from an ice-free tropical marine environment to the establishment of permanent polar ice caps and a cold temperate marine climate. The families represented are Crenellidae, Parallelodontidae, Glycymerididae, Limopsidae, Isognomonidae, Pectinidae, Propeamussiidae, and Limidae. New taxa include the genus\n Bathyisognomon\n and five new species: \nLimopsis squiresi\n, \nBathyisognomon smithwickensis\n, \nDelectopecten kieli\n, \nDelectopecten keaseyorum\n, and \nPropeamussium (Parvamussium) mistensis\n. Small to minute mud pectens and glass scallops are among the most abundant and frequent taxa in the Keasey fauna, although they are poorly preserved and have been overlooked heretofore. Pteriomorphs are prominent elements of recurring associations of species in mudstone and fine-grained siltstone facies adjacent to three Keasey cold methane seeps. Previously described Keasey anomalodesmatans and heteroconchs in these seep-adjacent strata have living relatives adapted to dysoxia and toxic geochemistry. Because the unique macrofaunal associations in these settings are neither seep fauna nor part of the background fauna, this paper introduces and defines the concept of a transitional \nperi-seep biotope\n. Relationships, monophyly, systematic resolution within major pteriomorph groups, and global biogeographic distributions are reviewed in each systematic treatment. Recurring patterns include occurrences in active margin settings, inferred oscillatory deepening of the calcium carbonate compensation depth, late Eocene origin of two-layered oceans following establishment of the Antarctic Circumpolar Current, and biogeographic gateway changes that disrupted earlier Paleogene larval dispersal patterns.",
    "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": "Eocene, bathyal, methane seep, peri-seep biotope, Cascadia Margin, doubthouse climate"
        }
    ],
    "section": "Article",
    "is_remote": true,
    "remote_url": "https://escholarship.org/uc/item/47m7252q",
    "frozenauthors": [
        {
            "first_name": "Carole",
            "middle_name": "S.",
            "last_name": "Hickman",
            "name_suffix": "",
            "institution": "Department of Integrative Biology and Museum of Paleontology\nUniversity of California, Berkeley CA 94720–4780",
            "department": "None"
        }
    ],
    "date_submitted": "2023-06-09T01:26:11+03:00",
    "date_accepted": "2023-06-09T01:26:11+03:00",
    "date_published": "2023-06-08T10:00:00+03:00",
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            "type": "pdf",
            "path": "https://journalpub.escholarship.org/ucmp_paleobios/article/41780/galley/31235/download/"
        }
    ]
}