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Disorientation of corals in Late Ordovician lime mudstone: A case for ephemeral, biodegradable substrate?

Cited 4 time in wos
Cited 4 time in scopus

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dc.contributor.authorLee, Mirinae-
dc.contributor.authorElias, Robert J.-
dc.contributor.authorChoh, Suk-Joo-
dc.contributor.authorLee, Dong-Jin-
dc.date.accessioned2020-10-20T04:03:49Z-
dc.date.available2020-10-20T04:03:49Z-
dc.date.issued2019-04-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/10882-
dc.description.abstractMassive coralla representing the tabulate coral Agetolites occur on a lime mudstone bed in the Upper Ordovician Xiazhen Formation of southeastern China. Other fossils include solitary rugose corals, bryozoans, trilobites, and mollusks. In addition, abundant spicules and spicule networks suggest that sponges were widespread. The occurrence of intact, unabraded fossils in micritic matrix and the absence of high-energy sedimentary structures indicate deposition in low-energy conditions. Thin section analysis of disoriented specimens demonstrates that geopetal indicators are consistent with stratigraphic "up" and differ from the growth axes of the corals, implying that geopetal infillings formed after disorientation. The growth axes of coralla were not redirected during life, suggesting that the corals were either dead at the time of disorientation or died as a result of disorientation. An examination of cyclomorphism indicates that the corals died at different times, rather than during a single event. A close association between sponges and corals is suggested by the presence of spicule networks in calices and intracorallum spaces of Agetolites. It is hypothesized that disorientation of corals was related to growth on biodegradable substrates. We suggest that many coral larvae settled on sponges that formed "sponge meadows". Disorientation of the resulting corals may have occurred when (1) a host sponge could no longer support the weight of a coral and collapsed, (2) increasing weight or imbalance of a coral caused it to fall off the sponge, or (3) a coral became detached when the sponge died and decomposed. If the coral was alive, sudden deposition in a disoriented position within muddy sediment resulted in its death. Disorientation of massive skeletons, such as colonial coralla, is most commonly attributed to water energy. This study suggests that ephemeral substrates may have been involved in some cases.en_US
dc.languageEnglishen_US
dc.language.isoenen_US
dc.subjectPhysical Geographyen_US
dc.subjectGeologyen_US
dc.subjectPaleontologyen_US
dc.subject.classification해당사항없음en_US
dc.titleDisorientation of corals in Late Ordovician lime mudstone: A case for ephemeral, biodegradable substrate?en_US
dc.title.alternative후기 오르도비스기 고착성 산호의 성장 방향과 보존 방향의 불일치 연구en_US
dc.typeArticleen_US
dc.identifier.bibliographicCitationLee, Mirinae, et al. 2019. "Disorientation of corals in Late Ordovician lime mudstone: A case for ephemeral, biodegradable substrate?". <em>PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY</em>, 520(1): 55-65.-
dc.citation.titlePALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGYen_US
dc.citation.volume520en_US
dc.citation.number1en_US
dc.identifier.doi10.1016/j.palaeo.2019.01.027-
dc.citation.startPage55en_US
dc.citation.endPage65en_US
dc.description.articleClassificationSCI-
dc.description.jcrRateJCR 2017:8.929en_US
dc.subject.keywordGeopetal structureen_US
dc.subject.keywordPalaeoecologyen_US
dc.subject.keywordSpongesen_US
dc.subject.keywordTabulate coralen_US
dc.subject.keywordTaphonomyen_US
dc.identifier.localId2019-0018-
dc.identifier.scopusid2-s2.0-85060886100-
dc.identifier.wosid000463125100005-
Appears in Collections  
2019-2019, Early animal evolution and the primitive Earth system of north Greenland (19-19) / Park, Tae-Yoon S. (PE19160)
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