Deciphering pyritization-kerogenization gradient for fish soft-tissue preservation

Osés, Gabriel Ladeira; Petri, Setembrino; Voltani, Cibele Gasparelo; Prado, Gustavo; Galante, Douglas; Rizzutto, M. A.; Rudnitzki, Isaac Daniel; Silva, Evandro Pereira da; Rodrigues, Fábio; Rangel, Elidiane Cipriano; Sucerquia, Paula Andrea; Pacheco, Mírian Liza Alves Forancelli

doi:10.1038/s41598-017-01563-0

Cited by 67 publications

(49 citation statements)

References 68 publications

(142 reference statements)

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“…The CH 4 is the unique hydrocarbon generated during diagenesis process. Thus, our results resemble the vertebrate (fish) pyritization-kerogenization model proposed by Osés et al (2017). In turn, Osés and his colleagues were based on the Ediacaran-Cambrian taphonomic model of Schiffbauer et al, (2014).…”

Section: Discussionsupporting

confidence: 80%

“…In turn, Osés and his colleagues were based on the Ediacaran-Cambrian taphonomic model of Schiffbauer et al, (2014). According to the study of Osés et al (2017), we considered that LP/UFC CRT 847 undergone preservation by kerogenization ( Figure 7).…”

Section: Discussionmentioning

confidence: 99%

“…Recently, different types of biopolymers have been attributed to different groups of fossil insects. The preservation of organic carbon in LP/UFC CRT 847 implies previous requirements such as rapid burial to avoid disarticulation; the cockroach fossil must have remained for a long period within methanogenetic zone, lower sulfate percolation (see Cai et al, 2012, Schiffbauer et al, 2014, Osés et al, 2017. In the methanogenetic zone, the decomposition is limited by labile tissues due to inability of decomposing heavy organic molecules (Canfield & Thamdrup, 2009;Schiffbauer et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The fossils are relatively abundant and diverse, including trace fossils, invertebrates, vertebrates, plants, and palynomorphs (Viana & Neumann, 2000). Due to the exceptionally preserved biota (Davis & Martill, 1999;Fielding et al, 2005;Heads et al, 2005;Menon & Martill, 2007;Silva et al, 2013;Delgado et al, 2014;Barling et al, 2015;Osés et al, 2016Osés et al, , 2017 the Crato Formation is considered a Konservat-Lagerstätte. The Crato Formation represents one of the largest Cretaceous insect deposits in the world, considering both taxonomic diversity and number of individuals (Grimaldi, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Throwing light on an uncommon preservation of Blattodea from the Crato Formation (Araripe Basin, Cretaceous), Brazil

Bezerra

Silva

Paula³

et al. 2018

Rev. bras. paleontol

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Fossilization results from several physical-chemical-geological processes. Original labile and non-bioclastic structures rarely survive throughout this process. In particular, the Crato Formation (Araripe Basin) is one of the most significant Cretaceous Konservat-Lagerstätten due to its well-preserved invertebrates, mainly three-dimensional insects. In general, Crato insects exhibit brown-orange color, constituted by goethite or hematite replacements. In this context, we used the scanning electron microscopy coupled to energy dispersive spectrometer and Raman spectroscopy to analyze Araripeblatta dornellesae, a 115 million-years-old fossil from Crato Formation, Araripe Basin. Our results show that a dark-color material rather than the brown-orange pattern preserve this specimen. The carbon is restricted to the fossil imprint, indicating some retention of the original organic remains. In addition, the presence of original organic components allowed to approach the biochemical aspects further than simple morphology, as well as to elucidate the taphonomical complexity involved in this preservation style.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Throwing light on an uncommon preservation of Blattodea from the Crato Formation (Araripe Basin, Cretaceous), Brazil

Bezerra

Silva

Paula³

et al. 2018

Rev. bras. paleontol

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“…We can speculate that there are at least two factors involved. Firstly, the nature of the microbially-mediated taphonomy and diagenesis in the Crato palaeo-lake setting has been shown to be critical in the preservation of labile structures in animals from the Crato Formation Konservat-Lagerstätte [14][15][16][17] . Secondly, perhaps only in part, the coriaceous nature of the fossil leaves played a role.…”

Section: Discussionmentioning

confidence: 99%

Cretaceous gnetalean yields first preserved plant gum

Roberts

Seyfullah

Loveridge

et al. 2020

Sci Rep

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Some liquid plant exudates (e.g. resin) can be found preserved in the fossil record. However, due to their high solubility, gums have been assumed to dissolve before fossilisation. The visual appearance of gums (water-soluble polysaccharides) is so similar to other plant exudates, particularly resin, that chemical testing is essential to differentiate them. Remarkably, Welwitschiophyllum leaves from early Cretaceous, Brazil provide the first chemical confirmation of a preserved gum. This is despite the leaves being exposed to water twice during formation and subsequent weathering of the crato formation. the Welwitschiophyllum plant shares the presence of gum ducts inside leaves with its presumed extant relative the gnetalean Welwitschia. This fossil gum presents a chemical signature remarkably similar to the gum in extant Welwitschia and is distinct from those of fossil resins. We show for the first time that a water-soluble plant exudate has been preserved in the fossil record, potentially allowing us to recognise further biomolecules thought to be lost during the fossilisation process. A wide variety of vascular plants produce fluid exudates 1 e.g. resins and gums, with each group differing in chemical definitions (Table 1). Due to similarity in physical appearance distinguishing exudates based on chemistry is vital, for example gums and resins are visually similar resulting in these terms being used interchangeably 1. However, their chemical definitions are very different (Table 1); resins are composed of lipid-soluble terpenoids 1,2 , while gums are complex, highly branched (non-starch) water-soluble polysaccharides 3. A common example of this misunderstanding is the Eucalyptus tree, which is known as a gum tree, but nuclear magnetic resonance analysis of the Eucalyptus exudate shows its composition to be polyphenolic and is therefore actually a kino 4 (Table 1). Differences between gum and resin can also be seen in the functional roles within the plant. The main roles of resins are to respond to wounding, as a defence against pathogens and to dissuade herbivory by insects and other organisms 2,5,6. Gum is involved in food storage, structural support, and also for wound sealing, but there is no common role across taxa 3. Further confusion arises as some plants, e.g. Boswellia and Commiphora species, even produce exudates with a mixture of polysaccharide and resin components (the gum resins myrrh and frankincense respectively) 1. Until now only fossilised plant resin (ambers) 7 and latex filaments have been reported preserved in the fossil record 8,9. While the fossilisation of fluid exudates might seem unlikely, the fossilisation of resin is relatively common, and extends back some 320 million years to the Carboniferous 10 , but chemically confirmed gums have never been reported. The Early Cretaceous (~120 million year old) Crato Formation 11 of northeast Brazil (Supplementary Fig. S1) is a well-known laminated limestone deposit that yields exceptionally preserved vertebrates, arthropods, and plants from the ...

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Correlation tests between relative light unit and colony forming unit for improving adenosine triphosphate bioluminescence analysis in bacterial consolidation treatments on palaeontological heritage

2022

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In this article bacterial carbonate mineralization treatments are proposed as a novel strategy for decayed fossils and palaeontological heritage conservation; specifically, by means of inoculation of Myxococcus xanthus, a bacterium of proven effectiveness in ornamental stone bioconsolidation. Bioconsolidation treatments can be very effective, stable, nontoxic, environmentally friendly, and chemically compatible with fossil heritage. The method reproduces what nature has been doing for millennia with fossils that have been permineralized by bacterial calcium carbonate precipitation. There is, however, some concern that bacterial inoculation could lead to the growth of undesirable microbiota, which could subsequently damage the fossil substrate. Because of this, the use of bacteria on heritage items must be meticulously monitored and analysis strategies should be carried out to detect bacteria viability during and after treatments. For this purpose, adenosine triphosphate assay is proposed in this article as a fast, affordable, portable, and easy‐to‐use system for conservators. as ATP assay results are relative and difficult to relate to colony forming unit, this study aims to improve their applicability by examining the correlation between ATP analysis and total viable bacteria count in the specific case of M. xanthus. This research provides reference and correlatable data to obtain an approximate estimation of M. xanthus viable bacterial colonies based on relative light unit data.

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Deciphering pyritization-kerogenization gradient for fish soft-tissue preservation

Cited by 67 publications

References 68 publications

Throwing light on an uncommon preservation of Blattodea from the Crato Formation (Araripe Basin, Cretaceous), Brazil

Throwing light on an uncommon preservation of Blattodea from the Crato Formation (Araripe Basin, Cretaceous), Brazil

Cretaceous gnetalean yields first preserved plant gum

Correlation tests between relative light unit and colony forming unit for improving adenosine triphosphate bioluminescence analysis in bacterial consolidation treatments on palaeontological heritage

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