Biomineralization, taphonomy, and diagenesis of Paleozoic lingulide brachiopod shells preserved in silicified mudstone concretions

Zabini, Carolina; Schiffbauer, James D.; Xiao, Shuhai; Kowalewski, Michał

doi:10.1016/j.palaeo.2012.02.010

Cited by 25 publications

(10 citation statements)

References 34 publications

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“…10H-10L). These microstructural features are in sharp contrast to those of permineralized coccoidal bacteria or organic-walled microfossils, which typically have coherent cell walls with stable thicknesses and various degrees of deformation and deflation (e.g., see phosphatized organic-walled microfossils illustrated in Zabini et al 2012, fig. 5F).…”

Section: Taphonomymentioning

confidence: 92%

Taphonomy and Biological Affinity of Three-Dimensionally Phosphatized Bromalites From the Middle Ordovician Winneshiek Lagerstätte, Northeastern Iowa, Usa

Hawkins

Liu

Briggs

et al. 2018

Palaios

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The Winneshiek Lagerstätte occurs within an Ordovician meteorite impact structure beneath part of the city of Decorah, Iowa. The Lagerstätte has yielded an atypical marine fauna including phyllocarid crustaceans, eurypterids, conodonts, linguloid brachiopods, and jawless fish. Associated with these taxa are vermiform fossils: elongate, morphologically variable, and often three-dimensionally preserved bromalites of uncertain organisms. The preservational state of these bromalites is significantly different from that of other components of the Winneshiek biota. Here we present a compositional and microstructural analysis of the vermiform fossils in order to elucidate their taphonomy and biological affinities. The majority of studied specimens are preserved three-dimensionally and composed of calcium phosphate, while a minority are preserved as carbonaceous compressions. Winneshiek bromalites exhibit important similarities to examples documented from both older and younger sediments. They provide independent evidence of predation in the Winneshiek assemblage during the Great Ordovician Biodiversification Event.

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Section: Taphonomymentioning

confidence: 92%

Taphonomy and Biological Affinity of Three-Dimensionally Phosphatized Bromalites From the Middle Ordovician Winneshiek Lagerstätte, Northeastern Iowa, Usa

Hawkins

Liu

Briggs

et al. 2018

Palaios

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“…A bioturbação pode intensificar a dissolução dentro da TAZ por reoxigenar uma coluna de sedimento superficial inicialmente anóxica e redutora (condição essa que favorece a preservação de conchas carbonáticas; Aller 1982Aller , 1994, Konhauser outro lado, organismos de concha com alto conteúdo orgânico podem servir como substrato para bactérias redutoras de sulfato, gerando H 2 S para a precipitação de sulfetos metálicos (Konhauser 1998, Zabini et al 2012. A perda tafonômica de restos bioclásticos é tida como sendo um processo simples de decaimento (exponencial) que diminui com a profundidade, pois os agentes oxidantes tornam-se menos potentes com a profundidade (Alexandersson 1978, Aller 1982, Cummins et al 1986, Powell 1992, Olszewski 1999, Tomasõvých et al 2006.…”

Section: Aspectos Geoquímicos Na Tazunclassified

Assinaturas tafonômicas em moluscos recentes e seu significado paleoambiental

2017

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A partir do tipo de dano (injúria) presente nos restos bioclásticos é possível inferir os processos de alteração de informação biológica que agem durante a incorporação destes restos no registro fossilífero. Tais danos, denominadas assinaturas tafonômicas, possuem direta relação com os fatores ambientais que atuaram após a morte e durante a permanência dos bioclastos no sedimento antes da fossilização final, e durante a eodiagênese. Assim, é possível interpretar as condições ambientais a partir da identificação do padrão de assinaturas tafonômicas presentes (perfil de dano) nos restos fossilizáveis. Propósito deste texto é explorar os prinpadrão de assinaturas tafonômicas presentes (perfil de dano) nos restos fossilizáveis. propósito deste texto é explorar os principais tipos de dano presentes em restos de moluscos (conchas) de acordo com sua origem ambiental. Além disso, será explicado como funciona, tafonomicamente, o intervalo sedimentar onde as assinaturas se originam, com detalhamento da bioturbação e dos principais aspectos geoquímicos presentes nesta zona de alteração dos restos biológicos. Será dada maior ênfase em estudos conduzidos com restos de moluscos marinhos, por serem mais bem conhecidos e mais numerosos na bibliografia. Também será demonstrada a viabilidade de interpretação paleoambiental a partir das assinaturas tafonômicas em moluscos.

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“…6B, E and 7D, E ); see ref. [ 17 ], like the Ordovician scyphozoan Sphenothallus that have integuments quite similar to some chitino-mineralized thecae of conulariids [ 17 , 44 , 45 ], and linguliids [ 46 ]. However, the theca of Corumbella is morphologically unique, because its polygonal plates sometimes have pores and papillae ( Fig.…”

Section: New Data On Structure and Morphologymentioning

confidence: 99%

Insights into the Skeletonization, Lifestyle, and Affinity of the Unusual Ediacaran Fossil Corumbella

et al. 2015

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The Ediacaran fossil Corumbella is important because it is hypothesized to be a scyphozoan cnidarian, and thus might be one of the rare examples of bona fide Neoproterozoic animals. Unfortunately, its mode of life, style of skeletonization, and taxonomic affinity have been very controversial. Here, we use X-ray micro-CT, SEM, and taphonomic analysis to compare preservational modes of Corumbella, in order to better understand the symmetry, mode of construction, preservational style, and taxonomy of this group. Results suggest that articulated and disarticulated specimens of Corumbella from the Ediacaran of Brazil, Paraguay, and the United States, although sometimes preserved very differently, represent the same taxon—Corumbella werneri. Corumbellids had a thick but flexible theca and probably lived with their basalmost part anchored in the sediment, much like Conotubus. When considered together, these results suggest that Corumbella was one of the first animals to build a skeleton, employing a lamellar microfabric similar to conulariids.

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Biomineralization, taphonomy, and diagenesis of Paleozoic lingulide brachiopod shells preserved in silicified mudstone concretions

Cited by 25 publications

References 34 publications

Taphonomy and Biological Affinity of Three-Dimensionally Phosphatized Bromalites From the Middle Ordovician Winneshiek Lagerstätte, Northeastern Iowa, Usa

Taphonomy and Biological Affinity of Three-Dimensionally Phosphatized Bromalites From the Middle Ordovician Winneshiek Lagerstätte, Northeastern Iowa, Usa

Assinaturas tafonômicas em moluscos recentes e seu significado paleoambiental

Insights into the Skeletonization, Lifestyle, and Affinity of the Unusual Ediacaran Fossil Corumbella

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