Spectroscopic studies of the fish fossils ( Cladocyclus gardneri and Vinctifer comptoni) from the Ipubi Formation of the Cretaceous Period

Filho, F.E. Sousa; Silva, J.H. da; Saraiva, G.D.; Abagaro, B.T.O.; Barros, Olga Alcântara; Saraiva, Antônio Álamo Feitosa; Viana, Bartolomeu C.; Freire, Paulo

doi:10.1016/j.saa.2015.12.022

Cited by 7 publications

(11 citation statements)

References 15 publications

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“… Notes. aReferences (Gunasekaran, Anbalagan & Pandi (2006), Legodi & Waal (2007), Silva et al (2013b), Silva et al (2013a), Alencar et al (2015) and Sousa Filho et al (2016)). …”

Section: Resultsmentioning

confidence: 99%

Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin)

Barros

Silva

Saraiva

et al. 2019

PeerJ

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The Ipubi and Romualdo Formations are Cretaceous units of the Araripe Basin (Santana Group). The first and most ancient was deposited in a lake environment, and some fossils were preserved in shales deposited under blackish conditions. The second was deposited in a marine environment, preserving a rich paleontological content in calcareous concretions. Considering that these two environments preserved their fossils under different processes, in this work we investigated the chemical composition of two fossilized specimens, one from each of the studied stratigraphic units, and compared them using vibrational spectroscopy techniques (Raman and IR), X-ray diffraction and large-field energy-dispersive X-ray spectroscopy (EDS) mappings. Calcite was observed as the dominant phase and carbon was observed in the fossils as a byproduct of the decomposition. The preservation of hydroxide calcium phosphate (Ca10(PO4)6(OH)2, hydroxyapatite) was observed in both fossils. In addition, it was observed that there was a smaller amount of pyrite (pyritization) in the Romualdo Formation sample than in the Ipubi one. Large-field EDS measurements showed the major presence of the chemical elements calcium, oxygen, iron, aluminum and fluoride in the Ipubi fossil, indicating a greater influence of inorganic processes in its fossilization. Our results also suggest that the Romualdo Formation fossilization process involved the substitution of the hydroxyl group by fluorine, providing durability to the fossils.

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“… Notes. aReferences (Gunasekaran, Anbalagan & Pandi (2006), Legodi & Waal (2007), Silva et al (2013b), Silva et al (2013a), Alencar et al (2015) and Sousa Filho et al (2016)). …”

Section: Resultsmentioning

confidence: 99%

Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin)

Barros

Silva

Saraiva

et al. 2019

PeerJ

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“…Specifically, the bands centered at 467 and 557 cm −1 are associated with antisymmetric deformation of PO 3− 4 ion, while the bands around 1020 cm −1 are related to the antisymmetric stretching of PO 3− 4 . Furthermore, calcite bands at 875 cm −1 correspond to symmetric deformations of CO 2− 3 , and bands at 1419 and 1460 cm −1 due to symmetric stretchings of CO 2− 3 were observed [2][3][4]. IR results were synergistic with the XRF and XRD analysis, suggesting together the presences of crystalline calcium, carbonate, and phosphate phases.…”

Section: Resultsmentioning

confidence: 81%

“…e IR spectra ( Figures 5 and 6) showed characteristic bands of hydroxyapatite [2][3][4]. Specifically, the bands centered at 467 and 557 cm −1 are associated with antisymmetric deformation of PO 3− 4 ion, while the bands around 1020 cm −1 are related to the antisymmetric stretching of PO 3− 4 .…”

Section: Resultsmentioning

confidence: 98%

“…Geochemical investigations and physical characterizations were performed to determine the composition of a fossil provide both taphonomic and ecologic data. Mineralogical composition of fossils can be adequately studied using physicochemical and mineralogical techniques such as X-ray fluorescence, X-ray diffraction, and infrared spectroscopy [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic Characterization of Eoholocene Bones Found in a Cave in Northeast Brazil

Oliveira

Viana

Barros

et al. 2018

Journal of Spectroscopy

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The preservation of fossils depends on several interactions of organic and inorganic chemical processes. The hard parts, which are more suitable for fossilization, might record valuable information of biogenic processes, while the taphonomic characteristics supply information on postmortem chemical transformation. Here, X-ray fluorescence, X-ray diffraction, and infrared spectroscopy analyses were carried out in Early Eoholocene fragments of bones collected from the subsurface at Gruta do Urso Fóssil, Ubajara National Park, northeast of Ceará State in Brazil. It is suggested a lower degree of decomposition, a preservation of the original mineral composition, along with some incidence of encrustation, and the occurrence of different animal species are analyzed. These preliminary data serve as a basis for future studies involving fossil biota from the deposits of Gruta do Urso Fóssil using spectroscopic techniques.

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“…(Mojarra fish) (dark blue line) with interpretation of typical proteinaceous compounds (Amide A, I, II, III, v(C=O), C-H stretch and a phosphate) with gray bands showing potential ranges based on Boatman et al (2019) ; Kong & Yu (2007) ; and Lee et al (2017) ; an extant bacteria biofilms (black, yellow and purple lines) taken and redraw from Lee et al. (2017) and Lindgren et al (2011b) ; Vinctifer comptoni (orange line) from the Cretaceous of Brazil, taken and redrawn from Sousa Filho et al. (2016) ; UR-CP-0001 aspidorhynchid fossil fish ‘skin’ treated with EDTA (red line); treated with HCl (green line); untreated (light blue line); and UR-CP-0001 infilling matrix (brown line).…”

Section: Resultsmentioning

confidence: 99%

Exceptionally preserved ‘skin’ in an Early Cretaceous fish from Colombia

Alfonso-Rojas

Cadena

2020

PeerJ

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Studies of soft tissue, cells and original biomolecular constituents preserved in fossil vertebrates have increased greatly in recent years. Here we report preservation of ‘skin’ with chemical and molecular characterization from a three-dimensionally preserved caudal portion of an aspidorhynchid Cretaceous fish from the equatorial Barremian of Colombia, increasing the number of localities for which exceptional preservation is known. We applied several analytical techniques including SEM-EDS, FTIR and ToF-SIMS to characterize the micromorphology and molecular and elemental composition of this fossil. Here, we show that the fossilized ‘skin’ exhibits similarities with those from extant fish, including the wrinkles after suffering compression stress and flexibility, as well as architectural and tissue aspects of the two main layers (epidermis and dermis). This similarity extends also to the molecular level, with the demonstrated preservation of potential residues of original proteins not consistent with a bacterial source. Our results show a potential preservation mechanism where scales may have acted as an external barrier and together with an internal phosphate layer resulting from the degradation of the dermis itself creating an encapsulated environment for the integument.

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Spectroscopic studies of the fish fossils ( Cladocyclus gardneri and Vinctifer comptoni) from the Ipubi Formation of the Cretaceous Period

Cited by 7 publications

References 15 publications

Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin)

Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin)

Spectroscopic Characterization of Eoholocene Bones Found in a Cave in Northeast Brazil

Exceptionally preserved ‘skin’ in an Early Cretaceous fish from Colombia

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