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Unaltered Nacre from the Pennsylvanian Buckhorn Asphalt, and Implications for the Arms Race Between Mollusks and Their Predators

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dc.contributor.authorVendrasco, Michael J.
dc.contributor.authorCheca, Antonio G.
dc.contributor.authorSquires, Richard R.
dc.contributor.authorPina Martínez, Carlos Manuel
dc.date.accessioned2023-06-17T22:41:35Z
dc.date.available2023-06-17T22:41:35Z
dc.date.issued2018
dc.description.abstractNanoscale details of original aragonite crystals and organic inclusions are preserved in shells from the Pennsylvanian Buckhorn Asphalt of Oklahoma, USA. Exceptional preservation occurred because, either during or shortly after deposition, oil migrated along wrench faults generated during the simultaneous Ouachita Orogeny. The early sealing by oil (later converted into asphalt) prevented diagenetic alteration of shell material. Field Emission Scanning Electron Microscopy (FE-SEM), Electron Backscatter Detection (EBSD), and Atomic Force Microscopy (AFM) reveal a striking high fidelity of preservation, including the oldest known unaltered nacre tablets in gastropods, bivalves, and cephalopods. These nacre tablets are indistinguishable from modern representatives in nanoscale morphology and crystallographic orientations. Fossils from the Buckhorn Asphalt show that by the Pennsylvanian Period, nacre and crossed lamellar were the dominant microstructures in the inner shell layer of the Mollusca. Calcitic microstructures and loosely organized horizontal bundles of aragonite fibers were common among Cambrian mollusks and problematic lophotrochozoans (e.g., hyoliths). Through the early to middle Paleozoic the dominance changed to more fracture-resistant textures nacre and crossed lamellar. This transition reflects the importance of these two types of shell microstructure in deterring predation, and it is clear that the ability to produce crossed lamellar and nacreous microstructures contributed to molluscan success during the Mesozoic and Cenozoic eras.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/55056
dc.identifier.doi10.2110/palo.2018.007
dc.identifier.issn0883-1351
dc.identifier.officialurlhttps://www.sepm.org/PALAIOS-1
dc.identifier.urihttps://hdl.handle.net/20.500.14352/18764
dc.issue.number10
dc.journal.titlePalaios
dc.language.isoeng
dc.page.final463
dc.page.initial451
dc.publisherSociety for Sedimentary Geology
dc.relation.projectIDCGL2013-48247-P
dc.rights.accessRightsrestricted access
dc.subject.cdu548
dc.subject.keywordNanoscale
dc.subject.keywordAragonito crystal
dc.subject.keywordMollusks
dc.subject.ucmCristalografía (Geología)
dc.titleUnaltered Nacre from the Pennsylvanian Buckhorn Asphalt, and Implications for the Arms Race Between Mollusks and Their Predators
dc.typejournal article
dc.volume.number33
dspace.entity.typePublication
relation.isAuthorOfPublicationea4a455d-94c9-4139-ba99-fbc6fea3e899
relation.isAuthorOfPublication.latestForDiscoveryea4a455d-94c9-4139-ba99-fbc6fea3e899
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