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    Middle Miocene Pholadid Borings at the Base of the Isidro Formation, Arroyo Mezquital, Baja California Sur, Mexico

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    Subject
    Middle Miocene; Pholadid Borings; Isidro Formation; Arroyo Mezquital; Baja California Sur; Mexico
    Author
    Demetrion, Robert A.; Squires, Richard L.
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    93
    Issue
    scas/vol93/iss2; 2
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/9695
    Abstract
    Abxxnddinl sediment-infilled clavate (club-shaped) borings, assignable <br /><br />to ichnogenus Gastrochaenolites, are reported from the base of the Miocene Isidro <br /><br />Formation, Baja California Sur, Mexico. The infilled borings were made by pho- <br /><br />ladid bivalves that lived in a nearshore-marine environment on a semi-consoli- <br /><br />dated substrate ("'Glossifungites'' ichnofacies). Some borings are connected by <br /><br />horizontal burrows that are sculptured (Spongeliomorpha) or unsculptured (Tha- <br /><br />lassinoides). The localized pholadid community was short lived and abruptly <br /><br />terminated by an influx of sediment.
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