Nannostructure and significance of fish coprolites in phosphorites

Lamboy, M.; Rao, V. Purnachandra; Ahmed, Ezzat A.; Azzouzi, Nasreddine

doi:10.1016/0025-3227(94)90068-x

Cited by 26 publications

(25 citation statements)

References 21 publications

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“…Similar filaments, tentatively interpreted as invading bacterial microbes covered by micron-sized apatite spherules, were previously noted in the Ediacaran Doushantuo embryos (e.g., Xiao and Knoll 1999). Similar micron-sized calcite and apatite spherules have also been noted in both recent microbial mats (Chafetz and Buczynski 1992) and fossil material like coprolites (e.g., Lamboy et al 1994;Cosmidis et al 2013;Zatoń and Rakociński 2014), or fossilized soft tissues (e.g., Briggs and Kear 1994;Briggs et al 2005). Thus, the microcrystals reported here may be the products of bacterially driven, extracellular phosphatization (e.g., Lamboy et al 1994).…”

Section: Preservationmentioning

confidence: 91%

“…Similar micron-sized calcite and apatite spherules have also been noted in both recent microbial mats (Chafetz and Buczynski 1992) and fossil material like coprolites (e.g., Lamboy et al 1994;Cosmidis et al 2013;Zatoń and Rakociński 2014), or fossilized soft tissues (e.g., Briggs and Kear 1994;Briggs et al 2005). Thus, the microcrystals reported here may be the products of bacterially driven, extracellular phosphatization (e.g., Lamboy et al 1994). Additionally, the egg capsule interiors are also filled with characteristic cauliflowerlike, apatite hemispheres, up to , 70 mm, covering both the base and inner side of the capsules preserved on C. nekrassovi and C. cf.…”

Section: Preservationmentioning

confidence: 95%

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Exceptionally Preserved Late Jurassic Gastropod Egg Capsules

Zatoń

Mironenko

2015

PALAIOS

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Exceptionally preserved, phosphatized gastropod egg capsules from the uppermost Jurassic (upper Volgian) in Central Russia are reported. The egg capsules were attached to the inner side of the shell wall of empty body chambers of two ammonites. Due to phosphatization, the egg capsules retained their original morphology preserving both the lower attachment base and upper hemispherical cover. Comparison with recent and fossil gastropod egg capsules indicates that these were not produced by neritimorphs, the egg capsules of which are known from the Lower Jurassic and Upper Cretaceous. Since these fossil egg capsules share many similarities with those produced by some recent rissoids and muricid neogastropods, it is evident that they were produced by some representatives of Caenogastropoda. The abundant filamentous microbial structures, as well as micron-sized apatite globules, preserved inside the egg capsules suggest that phosphatization processes were mediated by microbial consortia under anaerobic and low-pH conditions.

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Section: Preservationmentioning

confidence: 91%

Section: Preservationmentioning

confidence: 95%

Exceptionally Preserved Late Jurassic Gastropod Egg Capsules

Zatoń

Mironenko

2015

PALAIOS

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“…Certains auteurs ont insisté sur l'importance quantitative de ces éléments fécaux au sein des constituants biogènes des sédiments (Martinez 2003). Mais l'on doit à Lamboy d'avoir affirmé que les éléments fécaux pouvaient avoir une part essentielle dans la constitution de gisements phosphatés (Lamboy 1982;Lamboy et al 1994 Un accord unanime existe, par ailleurs, au sujet du rôle joué par les micro-organismes dans la mobilisation et la précipitation des ions phosphates au sein des sédiments dans des conditions sub-oxiques (Krajewski et al 1974;Lucas et Prévôt 1984;Bréhéret 1991;Reimers et al 1996;Hubert et al 2005). Ces micro-organismes ont, bien sûr, un rôle essentiel tout au long de la diagenèse phosphatée lorsque le P est obtenu, sous l'effet de mécanismes microbiens, aux dépens des liaisons biochimiques auxquelles il appartient.…”

Section: Enseignements Recueillis Sur L'origine Des Pelletsunclassified

“…Ces micro-organismes ont, bien sûr, un rôle essentiel tout au long de la diagenèse phosphatée lorsque le P est obtenu, sous l'effet de mécanismes microbiens, aux dépens des liaisons biochimiques auxquelles il appartient. Des cyanobactéries sont ainsi considérées comme responsables de la concentration du P dans le sédiment superficiel, au sein de mats grossièrement stromatolithiques et où s'initient des phénomènes de "nodulisation" conduisant aux nodules et aux péloides irréguliers observés dans de nombreux gisements (Champetier et Joussemet 1979;Lamboy 1982;Soudry 1993;Lewy 1990;Lamboy et al 1994;Reimers et al 1996 ;Krajewski et al 2000). Les cyanobactéries ont aussi été reconnues comme responsables de la genèse des péloides constituant les phosphates lagonaires d'atolls (Trichet et Fikri 1997).…”

Section: Enseignements Recueillis Sur L'origine Des Pelletsunclassified

Pétrographie et géochimie comparées des pellets phosphatés et de leur gangue dans le gisement phosphaté de Ras-Draâ (Tunisie). Implications sur la genèse des pellets phosphatés

et al. 2010

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The Paleocene-Early Eocene phosphate outcrop in the Ras-Draâ deposit (Tunisia; Fig.1) comprises alternances of P-rich strata (P 2 O 5 ≥ 18%) and P-poor ones (P 2 O 5 ≤ 2%). In phosphate rich strata, P is concentrated in rounded grains -so-called pellets -( 28 % ≤ P 2 O 5 ≤ 38 %) embedded in a matrix -so-called exogangue -much poorer in P (P 2 O 5 # 7%) than pellets. The study of pellets (whose size lies mainly between 100 and 500 µm), of their surrounding matrix and of poorly phosphatic sediments interlayered between the phosphatic strata, has been Microscopic observations of Ras-Draâ phosphorites, added to geochemical results, establish that pellets are small bodies, allochtonous to their matrix and whose composition is independent of that of this matrix. Fecal cylindrical bodies and subspherical pellets, the latest being supposed to proceed from the fecal bodies by fragmentation, are considered to have been formed by fishes, as P-rich and organic matter-rich faeces. These faeces turn out to be resistant to mechanical dispersion and to chemical diffusion of soluble elements from and in direction of sea water. This closeness is responsible for the strong reducing conditions having prevailed inside and during the pellets diagenesis.-3 - ABRIDGED ENGLISH VERSION

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“…Combined with their unique food inclusions, information on their size and shape therefore is very useful in reconstructing potential producers (Northwood, 2005). The morphological characteristics of coprolites produced by different groups of animals in aquatic habitats have been examined frequently (Kraeuter and Haven, 1970;McAllister, 1985;Schmitz et al, 1991;Lamboy et al, 1994;Nothwood, 2005;Milàn et al, 2012a;Eriksson et al, 2011;Shen et al, 2014;Kietzmann and Palma, 2014). For example, faeces produced by marine invertebrates were relatively small, with a maximum length commonly <5 mm (Kraeuter and Haven, 1970;Arakawa, 1971;Northwood, 2005;Shen et al, 2014;Kietzmann and Palma, 2014).…”

Section: Coprolite Producersmentioning

confidence: 99%

Taphonomy and palaeobiology of early Middle Triassic coprolites from the Luoping biota, southwest China: Implications for reconstruction of fossil food webs

Luo

Benton

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractAbundant exceptionally preserved coprolites are documented from the Luoping biota (Anisian, Middle Triassic) of Yunnan Province, southwest China. These coprolites can be categorized into four morphological types: 1) bead to ribbon-shaped, 2) short to long rod-shaped, 3) flattened, disk-like, and 4) segmented faeces. Detailed multi-disciplinary studies reveal that coprolite type 1 was likely produced by an invertebrate animal, while coprolite types 2 to 4 could be faeces generated by carnivorous fishes or marine reptiles, perhaps from different taxonomic groups. When compared with coprolites reported from the Lower Triassic, the Luoping forms indicate more complicated predation-prey food web networks, suggesting the emergence of complex trophic ecosystems in the Anisian, marking the full biotic recovery following the Permian-Triassic Mass Extinction.

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Nannostructure and significance of fish coprolites in phosphorites

Cited by 26 publications

References 21 publications

Exceptionally Preserved Late Jurassic Gastropod Egg Capsules

Exceptionally Preserved Late Jurassic Gastropod Egg Capsules

Pétrographie et géochimie comparées des pellets phosphatés et de leur gangue dans le gisement phosphaté de Ras-Draâ (Tunisie). Implications sur la genèse des pellets phosphatés

Taphonomy and palaeobiology of early Middle Triassic coprolites from the Luoping biota, southwest China: Implications for reconstruction of fossil food webs

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