Nanometer-scale characterization of exceptionally preserved bacterial fossils in Paleocene phosphorites from Ouled Abdoun (Morocco)

Geobiology

Volumn 11, Issue 2, 2013, Pages 139-153

  Cosmidis, J ^a,b   Benzerara, K ^a   Gheerbrant, E ^c   Esteve I ^a   Bouya, B ^d   Amaghzaz, M ^d  

^a UNIVERSITÉ PIERRE ET MARIE CURIE   (France)

^b INSTITUT DE PHYSIQUE DU GLOBE DE PARIS   (France)

^c MUSÉUM NATIONAL D'HISTOIRE NATURELLE   (France)

^d Centre Minier de Khouribga   (Morocco)

Author keywords

[No Author keywords available]

Indexed keywords

COPROPHAGY; EXPERIMENTAL STUDY; FOSSIL; FRANCOLITE; LABORATORY METHOD; MICROBIAL COMMUNITY; PALEOCENE; PHOSPHORITE; SCANNING ELECTRON MICROSCOPY;

ARTICLE; BACTERIUM; CHEMISTRY; ELECTRON MICROSCOPY; FOSSIL; MICROBIOLOGY; MOROCCO; SOIL; SPECTROSCOPY; ULTRASTRUCTURE;

BACTERIA; FOSSILS; MICROSCOPY, ELECTRON; MOROCCO; SOIL; SOIL MICROBIOLOGY; SPECTRUM ANALYSIS;

MOROCCO; ORIENTAL; OULED ABDOUN BASIN;

BACTERIA (MICROORGANISMS); NEGIBACTERIA;

EID: 84873568285     PISSN: 14724677     EISSN: 14724669     Source Type: Journal    
DOI: 10.1111/gbi.12022     Document Type: Article

References (121)

1. Alibo DS, Nozaki Y (1999) Rare earth elements in seawater: particle association, shale-normalization, and Ce oxidation. Geochimica et Cosmochimica Acta 63, 363-372.
2. Altschuler ZS (1980) The geochemistry of trace elements in marine phosphorites part I. Characteristic abundances and enrichment. In Marine Phosphorites (ed. Bentor YK). SEPM Special Publication, Tulsa, 29, pp. 19-30.
3. Altschuler ZS, Clarke RS, Young EJ (1958) Geochemistry of Uranium in Apatite and Phosphorite. Geological Survey Professional Paper, United State Government Printing Office, Washington.
4. Álvaro JJ, Clausen S (2010) Morphology and ultrastructure of epilithic versus cryptic, microbial growth in lower Cambrian phosphorites from the Montagne Noire, France. Geobiology 8, 89-100.
5. Arning ET, Birgel D, Brunner B, Peckmann J (2009) Bacterial formation of phosphatic laminites off Peru. Geobiology 7, 295-307.
6. Baturin GN, Kochenov AV (2001) Uranium in phosphorites. Lithology and Mineral Resources 36, 303-321.
7. Baturin GN, Titov AT (2006) Biomorphic formations in recent phosphorites. Oceanology 46, 711-715.
8. Beazley MJ, Martinez RJ, Sobecky PA, Webb SM, Taillefert M (2009) Nonreductive biomineralization of uranium(VI) phosphate via microbial phosphatase activity in anaerobic conditions. Geomicrobiology Journal 26, 431-441.
9. Bengtson S, Belivanova V, Rasmussen B, Whitehouse M (2009) The controversial "Cambrian" fossils of the Vindhyan are real but more than a billion years older. Proceedings of the National Academy of Sciences 106, 7729-7734.
10. Benzerara K, Menguy N, Guyot F, Skouri F, de Luca G, Barakat M, Heulin T (2004a) Biologically controlled precipitation of calcium phosphate by Ramlibacter tataouinensis. Earth and Planetary Science Letters 228, 439-449.
11. Benzerara K, Yoon TH, Tyliszczak T, Constantz B, Spormann AM, Brown GE Jr (2004b) Scanning transmission X-ray microscopy study of microbial calcification. Geobiology 2, 249-259.
12. Benzerara K, Miller VM, Barell G, Kumar V, Miot J, Brown GE Jr, Lieske JC (2006) Search for microbial signatures within human and microbial calcifications using soft X-ray spectromicroscopy. Journal of Investigative Medicine 54, 367-379.
13. Benzerara K, Morin G, Yoon T, Miot J, Tyliszczak T, Casiot C, Bruneel O, Farges F, Brown GE Jr (2008) Nanoscale study of As biomineralization in an acid mine drainage system. Geochimica et Cosmochimica Acta 72, 3949-3963.
14. Benzerara K, Menguy N, Obst M, Stolarski J, Mazur M, Tylisczak T, Brown GE Jr, Meibom A (2011) Study of the crystallographic architecture of corals at the nanoscale by scanning transmission X-ray microscopy and transmission electron microscopy. Ultramicroscopy 111, 1268-1275.
15. Berndmeyer C, Birgel D, Brunner B, Wehrmann LM, Jöns N, Bach W, Arning ET, Föllmi KB, Peckmann J (2012) The influence of bacterial activity on phosphorite formation in the Miocene Monterey Formation, California. Palaeogeography Palaeoclimatology Palaeoecology 317-318, 171-181.
16. Beveridge TJ, Meloche JD, Fyfe WS, Murray RGE (1983) Diagenesis of metals chemically complexed to bacteria: laboratory formation of metal phosphates sulfides and organic condensates in artificial sediments. Applied and Environmental Microbiology 45, 1094-1108.
17. Blake RE, O'Neil JR, Garcia GA (1998) Effects of microbial activity on the delta 18 O of dissolved inorganic phosphate and textural features of synthetic apatites. American Mineralogist 83, 1516-1531.
18. Brasier MD, Green OR, Jephcoat AP, Kleppe AK, Van Kranendonk MJ, Lindsay JF, Steele A, Grassineau NV (2002) Questioning the evidence for Earth's oldest fossils. Nature 416, 76-81.
19. Bréhéret J-G (1991) Phosphatic concretions in black facies of the Aptian-Albian Marnes bleues Formation of the Vocontian basin (SE France), and at site DSDP 369: evidence of benthic microbial activity. Cretaceous Research 12, 411-435.
20. Burnett W, Veeh H (1977) Uranium-series disequilibrium studies in phosphorite nodules from the west coast of South America. Geochimica et Cosmochimica Acta 41, 755-764.
21. Cappetta H (1981) Additions a la faune de sélaciens fossiles du Maroc. Geobios 14, 563-575.
22. Carrigan WJ, Cameron EM (1991) Petrological and stable isotope studies of carbonate and sulfide minerals from the Gunflint Formation Ontario: evidence for the origin of early Proterozoic iron-formation. Precambrian Research 52, 347-380.
23. Cayeux L (1936) Existence de nombreuses bactéries dans les phosphates sédimentaires de tout âge. Comptes Rendus de l'Académie des Sciences 203, 1198-1200.
24. Chen J-Y, Bottjer DJ, Li G, Hadfield MG, Gao F, Cameron AR, Zhang CY, Xian D-C, Tafforeau P, Liao X, Yin Z-J (2009) Complex embryos displaying bilaterian characters from Precambrian Doushantuo phosphate deposits, Weng'an, Guizhou, China. Proceedings of the National Academy of Sciences 106, 19056-19060.
25. Clarke R Jr, Altschuler Z (1958) Determination of the oxidation state of uranium in apatite and phosphorite deposits. Geochimica et Cosmochimica Acta 13, 127-142.
26. Coulson RA, Hernández T (1964) Biochemistry of the Alligator, Louisiana State University Press, Baton Rouge.
27. Cowen JP, Bruland KW (1985) Metal deposits associated with bacteria: implications for Fe and Mn marine biogeochemistry. Deep Sea Research Part A. Oceanographic Research Papers 32, 253-272.
28. De Baar HJW, Bacon MP, Brewer PG, Bruland KW (1985) Rare earth elements in the Pacific and Atlantic Oceans. Geochimica et Cosmochimica Acta 49, 1943-1959.
29. Degens ET, Okada H, Honjo S, Hathaway JC (1972) Microcrystalline sphalerite in resin globules suspended in Lake Kivu East Africa. Mineralium Deposita 7, 1-12.
30. Dohnalkova AC, Marshall MJ, Arey BW, Williams KH, Buck EC, Fredrickson JK (2010) Imaging hydrated microbial extracellular polymers: comparative analysis by electron microscopy. Applied and Environmental Microbiology 77, 1254-1262.
31. Elderfield H, Greaves MJ (1982) The rare earth elements in seawater. Nature 296, 214-219.
32. Ennever J (1963) Microbiologic calcification. Annals of the New York Academy of Sciences 109, 4-13.
33. Ferris FG, Fyfe WS, Beveridge TJ (1988) Metallic ion binding by Bacillus subtilis: implications for the fossilization of microorganisms. Geology 16, 149.
34. Ferris FG, Tazaki K, Fyfe WS (1989) Iron oxides in acid mine drainage environments and their association with bacteria. Chemical Geology 74, 321-330.
35. Filippelli GM (1997) Controls on phosphorus concentration and accumulation in oceanic sediments. Marine Geology 139, 231-240.
36. Fisher DC (1981) Crocodilian scatology, microvertebrate concentrations, and enamel-less teeth. Paleobiology 7, 262-275.
37. 2, 3-edge XANES of carbonates, carbonate apatite, and oldhamite (CaS). American Mineralogist 94, 1235-1241.
38. Föllmi K (1996) The phosphorus cycle, phosphogenesis and marine phosphate-rich deposits. Earth-Science Reviews 40, 55-124.
39. Fortin D, Ferris FG, Beveridge TJ (1997) Surface-mediated mineral development by bacteria. Reviews in Mineralogy and Geochemistry 35, 161-180.
40. Galvez ME, Beyssac O, Benzerara K, Bernard S, Menguy N, Cox SC, Martinez I, Johnston MR, Brown GE (2012) Morphological preservation of carbonaceous plant fossils in blueschist metamorphic rocks from New Zealand. Geobiology 10, 118-129.
41. Gan Y, Han D, Gu F, Wang Z, Guo G (2010) Biomimetic synthesis of calcium-strontium apatite hollow nanospheres. Science China Chemistry 53, 1723-1727.
42. Gheerbrant E (2009) Paleocene emergence of elephant relatives and the rapid radiation of African ungulates. Proceedings of the National Academy of Sciences 106, 10717-10721.
43. Gheerbrant E, Sudre J, Cappetta H (1996) A Palaeocene proboscidean from Morocco. Nature 383, 68-70.
44. Gheerbrant E, Sudre J, Cappetta H, Bignot G (1998) Phosphatherium escuillieidu Thanétien du Bassin des Ouled Abdoun (Maroc), plus ancien proboscidien (Mammalia) d'Afrique. Geobios 31, 247-269.
45. Gheerbrant E, Sudre J, Cappetta H, Mourer-Chauviré C, Bourdon E, Iarochene M, Amaghzaz M, Bouya B (2003) The mammal localities of Grand Daoui Quarries, Ouled Abdoun Basin, Morocco, Ypresian: a first survey. Bulletin de la Societe Geologique de France 174, 279-293.
46. Goldhammer T, Brüchert V, Ferdelman TG, Zabel M (2010) Microbial sequestration of phosphorus in anoxic upwelling sediments. Nature Geoscience 3, 557-561.
47. Hanhan S, Smith AM, Obst M, Hitchcock AP (2009) Optimization of analysis of soft X-ray spectromicroscopy at the Ca 2p edge. Journal of Electron Spectroscopy and Related Phenomena 173, 44-49.
48. Heaney PJ, Veblen DR (1991) An examination of spherulitic dubiomicrofossils in Precambrian banded iron formations using the transmission electron microscope. Precambrian Research 49, 355-372.
49. Heaney PJ, Vicenzi EP, Giannuzzi LA, Livi KJT (2001) Focused ion beam milling: a method of site-specific sample extraction for microanalysis of Earth and planetary materials. American Mineralogist 86, 1094-1099.
50. Hirschler A, Lucas J, Hubert J (1990) Apatite genesis: a biologically induced or biologically controlled mineral formation process? Geomicrobiology Journal 8, 47-56.
51. Hitchcock AP (2012) aXis 2000 - Analysis of X-ray Images and Spectra, McMaster University, Hamilton, ON, Canada.
52. Hollocher KT, Hollocher TC, Rigby JK (2010) A phosphatic coprolite lacking diagenetic permineralization from the upper Cretaceous Hell Creek formation, northeastern Montana: importance of dietary calcium phosphate in preservation. Palaios 25, 132-140.
53. Huldtgren T, Cunningham JA, Yin C, Stampanoni M, Marone F, Donoghue PCJ, Bengtson S (2011) Fossilized nuclei and germination structures identify Ediacaran "animal embryos" as encysting protists. Science 334, 1696-1699.
54. Javaux EJ, Benzerara K (2009) Microfossils. Comptes Rendus Palevol 8, 605-615.
55. Johnston MA, Porter DE, Scott GI, Rhodes WE, Webster LF (2010) Isolation of faecal coliform bacteria from the American alligator (Alligator mississippiensis). Journal of Applied Microbiology 108, 965-973.
56. Kim H-W, Gu H-J, Lee H-H (2007) Microspheres of collagen-apatite nanocomposites with osteogenic potential for tissue engineering. Tissue Engineering 13, 965-973.
57. Kishimoto-Okada A, Murakami S, Ito Y, Horii N, Furukawa H, Takagi J, Iwasaki K (2010) Comparison of the envelope architecture of E. coli using two methods: CEMOVIS and cryo-electron tomography. Journal of Electron Microscopy 59, 419-426.
58. Kolodny Y, Kaplan I (1970) Uranium isotopes in sea-floor phosphorites. Geochimica et Cosmochimica Acta 34, 3-24.
59. Krajewski KP, Vancappellen P, Trichet J, Kuhn O, Lucas J, Martinalgarra A, Prévôt L, Tewari VC, Gaspar L, Knight RI, Lamboy M (1994) Biological processes and apatite formation in sedimentary environments. Eclogae Geologicae Helvetiae 87, 701-745.
60. LaBerge GL (1973) Possible biological origin of Precambrian iron-formations. Economic Geology 68, 1098-1109.
61. Lamboy M (1994) Nanostructure and genesis of phosphorites from ODP Leg 112, the Peru margin. Marine Geology 118, 5-22.
62. Lehmann J, Liang B, Solomon D, Lerotic M, Luizão F, Kinyangi J, Schäfer T, Wirick S, Jacobsen C (2005) Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: application to black carbon particles. Global Biogeochemical Cycles 19, 1-12.
63. Lepot K, Benzerara K, Philippot P (2011) Biogenic versus metamorphic origins of diverse microtubes in 2.7Gyr old volcanic ashes: multi-scale investigations. Earth and Planetary Science Letters 312, 37-47.
64. Lerotic M, Jacobsen C, Schäfer T, Vogt S (2004) Cluster analysis of soft X-ray spectromicroscopy data. Ultramicroscopy 100, 35-57.
65. Lerotic M, Jacobsen C, Gillow JB, Francis AJ, Wirick S, Vogt S, Maser J (2005) Cluster analysis in soft X-ray spectromicroscopy: finding the patterns in complex specimens. Journal of Electron Spectroscopy and Related Phenomena 144-147, 1137-1143.
66. Li P, Ohtsuki C, Kokubo T, Nakanishi K, Soga N, Nakamura T, Yamamuro T (1993) Process of formation of bone-like apatite layer on silica gel. Journal of Materials Science: Materials in Medicine 4, 127-131.
67. Lucas J, Prévôt L (1984) Synthèse de l'apatite par voie bactérienne à partir de matière organique phosphatée et de divers carbonates de calcium dans des eaux douce et marine naturelles. Chemical Geology 42, 101-118.
68. Lucas J, Prévôt-Lucas L (1995) Tethyan phosphates and bioproductites. In The Ocean Basins and Margins Vol. 8: The Tethys Ocean (eds Nairn AEM, Ricou L-E, Vrielynck B, Dercourt J). Plenum Press, New York, pp. 367-391.
69. Lundberg J, McFarlane DA (2011) Subaerial freshwater phosphatic stromatolites in Deer Cave, Sarawak - a unique geobiological cave formation. Geomorphology 128, 57-72.
70. Madigan MT, Martinko JM, Dunlap PV, Clark DP (2009) Brock Biology of Microorganisms, 12th edn, Pearson/Benjamin Cummings, San Francisco.
71. Matias VRF, Al-Amoudi A, Dubochet J, Beveridge TJ (2003) Cryo-transmission electron microscopy of frozen-hydrated sections of Escherichia coli and Pseudomonas aeruginosa. Journal of Bacteriology 185, 6112-6118.
72. McArthur JM, Walsh JN (1984) Rare-earth geochemistry of phosphorites. Chemical Geology 47, 191-220.
73. Meyers JH (1987) Marine vadose beachrock cementation by cryptocrystalline magnesian calcite, Maui, Hawaii. Journal of Sedimentary Research 57, 558-570.
74. Miot J, Benzerara K, Morin G, Kappler A, Bernard S, Obst M, Férard C, Skouri-Panet F, Guigner J-M, Posth N, et al. (2009) Iron biomineralization by anaerobic neutrophilic iron-oxidizing bacteria. Geochimica Et Cosmochimica Acta 73, 696-711.
75. Miot J, Maclellan K, Benzerara K, Boisset N (2011) Preservation of protein globules and peptidoglycan in the mineralized cell wall of nitrate-reducing, iron(II)-oxidizing bacteria: a cryo-electron microscopy study. Geobiology 9, 459-470.
76. Mullins HT, Rasch RF (1985) Sea-floor phosphorites along the Central California continental margin. Economic Geology 80, 696-715.
77. Naftel SJ, Sham TK, Yiu YM, Yates BW (2001) Calcium L-edge XANES study of some calcium compound. Journal of Synchrotron Radiation 8, 255-257.
78. O'Brien GW, Harris JR, Milnes AR, Veeh HH (1981) Bacterial origin of East Australian continental margin phosphorites. Nature 294, 442-444.
79. 3 (aragonite-like) by cyanobacteria: a STXM study of the influence of EPS on the nucleation process. Geochimica et Cosmochimica Acta 73, 4180-4198.
80. Oehler JH (1976) Hydrothermal crystallization of silica gel. Geological Society of America Bulletin 87, 1143.
81. Orange F, Disnar J-R, Westall F, Prieur D, Baillif P (2011) Metal cation binding by the hyperthermophilic microorganism, Archaea Methanocaldococcus Jannaschii, and its effects on silicification. Palaeontology 54, 953-964.
82. Pan Y, Fleet ME (2002) Compositions of the apatite-group minerals: substitution mechanisms and controlling factors. Reviews in Mineralogy and Geochemistry 48, 13-49.
83. Perez RA, Del Valle S, Altankov G, Ginebra M-P (2011) Porous hydroxyapatite and gelatin/hydroxyapatite microspheres obtained by calcium phosphate cement emulsion. Journal of Biomedical Materials Research Part B: Applied Biomaterials 97B, 156-166.
84. Phoenix VR, Renaut RW, Jones B, Ferris FG (2005) Bacterial S-layer preservation and rare arsenic-antimony-sulphide bioimmobilization in siliceous sediments from Champagne Pool hot spring, Waiotapu, New Zealand. Journal of the Geological Society 162, 323-331.
85. Piper DZ, Baedecker PA, Crock JG, Burnett WC, Loebner BJ (1988) Rare earth elements in the phosphatic-enriched sediment of the Peru shelf. Marine Geology 80, 269-285.
86. Prescott LM, Harley JP, Klein DA (2002) Microbiology, 5th edn. McGraw-Hill Higher Education, Dubuque.
87. Purnachandra Rao V, Naqvi SWA, Dileep Kumar M, Cardinal D, Michard A, Borole DV, Jacobs E, Natarajan R (2000) A comparative study of Pleistocene phosphorites from the continental slope off western India. Sedimentology 47, 945-960.
88. Raff EC, Schollaert KL, Nelson DE, Donoghue PCJ, Thomas C-W, Turner FR, Stein BD, Dong X, Bengtson S, Huldtgren T, Stampanoni M, Chongyu Y, Raff RA (2008) Embryo fossilization is a biological process mediated by microbial biofilms. Proceedings of the National Academy of Sciences 105, 19360-19365.
89. Reimers CE, Kastner M, Garrison RE (1990) The role of bacterial mats in phosphate mineralization with particular reference to the Monterey Formation. In Phosphate Deposits of the World: Neogene to Modern Phosphorites (eds Burnett WC, Riggs SR). Cambridge University Press, Cambridge, pp. 300-311.
90. Rivadeneyra MA, Martín-Algarra A, Sánchez-Román M, Sánchez-Navas A, Martín-Ramos JD (2010) Amorphous Ca-phosphate precursors for Ca-carbonate biominerals mediated by Chromohalobacter marismortui. The ISME Journal 4, 922-932.
91. Rizzo AA, Scott DB, Bladen HA (1963) Calcification of oral bacteria. Annals of the New York Academy of Sciences 109, 14-22.
92. Sánchez-Navas A, Martín-Algarra A (2001) Genesis of apatite in phosphate stromatolites. European Journal of Mineralogy 13, 361-376.
93. Schiffbauer JD, Wallace AF, Hunter JL, Kowalewski M, Bodnar RJ, Xiao S (2012a) Thermally-induced structural and chemical alteration of organic-walled microfossils: an experimental approach to understanding fossil preservation in metasediments. Geobiology 10, 402-423.
94. Schiffbauer JD, Xiao S, Sharma KS, Wang G (2012b) The origin of intracellular structures in Ediacaran metazoan embryos. Geology 40, 223-226.
95. Schuffert J, Kastner M, Emanuele G, Jahnke R (1990) Carbonate-ion substitution in francolite: a new equation. Geochimica et Cosmochimica Acta 54, 2323-2328.
96. Schultze-Lam S, Beveridge TJ (1994) Nucleation of celestite and strontianite on a cyanobacterial S-layer. Applied and Environmental Microbiology 60, 447-453.
97. Schulz HN, Schulz HD (2005) Large sulfur bacteria and the formation of phosphorite. Science 307, 416-418.
98. Seltmann G, Holst O (2001) The Bacterial Cell Wall, Springer, Berlin.
99. Shelobolina ES, Konishi H, Xu H, Roden EE (2009) U(VI) sequestration in hydroxyapatite produced by microbial glycerol 3-phosphate metabolism. Applied and Environmental Microbiology 75, 5773-5778.
100. Shields GA, Webb GE (2004) Has the REE composition of seawater changed over geological time? Chemical Geology 204, 103-107.
101. Sigel A, Sigel H, Sigel RKO (2008) Metal Ions in life Sciences. From Nature to Application. 4, Biomineralization, Wiley, Chichester.
102. Solomon D, Lehmann J, Kinyangi J, Liang B, Heymann K, Dathe L, Hanley K, Wirick S, Jacobsen C (2009) Carbon (1s) NEXAFS spectroscopy of biogeochemically relevant reference organic compounds. Soil Science Society of America Journal 73, 1817-1830.
103. Soudry D (1992) Primary bedded phosphorites in the Campanian Mishash Formation, Negev, Southern Israel. Sedimentary Geology 80, 77-88.
104. Soudry D (2000) Microbial phosphate sediment. In Microbial Sediments (eds Riding RE, Awramik SM). Springer, Berlin Heidelberg, pp. 127-136.
105. Soudry D, Lewy Z (1988) Microbially influenced formation of phosphate nodules and megafossil moulds (Negev, Southern Israel). Palaeogeography, Palaeoclimatology, Palaeoecology 64, 15-34.
106. Soudry D, Ehrlich S, Yoffe O, Nathan Y (2002) Uranium oxidation state and related variations in geochemistry of phosphorites from the Negev (Southern Israel). Chemical Geology 189, 213-230.
107. Southam G, Donald R (1999) A structural comparison of bacterial microfossils vs. "nanobacteria" and nanofossils. Earth-Science Reviews 48, 251-264.
108. Souza-Egipsy V, Aguilera A, Mateo-Martí E, Martín-Gago JA, Amils R (2010) Fossilization of acidophilic microorganisms. Geomicrobiology Journal 27, 692-706.
109. Sun R, Lu Y, Chen K (2009) Preparation and characterization of hollow hydroxyapatite microspheres by spray drying method. Materials Science and Engineering: C 29, 1088-1092.
110. Teshima K, Sakurai M, Lee S, Yubuta K, Ito S, Suzuki T, Shishido T, Endo M, Oishi S (2009) Morphologically controlled fibrous spherulites of an apatite precursor biocrystal. Crystal Growth & Design 9, 650-652.
111. Thompson JB, Ferris FG (1990) Cyanobacterial precipitation of gypsum calcite and magnesite from natural alkaline lake water. Geology 18, 995-998.
112. Toporski JKW (2002) Morphologic and spectral investigation of exceptionally well-preserved bacterial biofilms from the Oligocene Enspel formation, Germany. Geochimica et Cosmochimica Acta 66, 1773-1791.
113. Toporski JKW, Steele A, Westall F, Thomas-Keprta KL, McKay DS (2002) The simulated silicification of bacteria - new clues to the modes and timing of bacterial preservation and implications for the search for extraterrestrial microfossils. Astrobiology 2, 1-26.
114. Tütken T, Vennemann TW, Pfretzschner H-U (2008) Early diagenesis of bone and tooth apatite in fluvial and marine settings: constraints from combined oxygen isotope, nitrogen and REE analysis. Palaeogeography, Palaeoclimatology, Palaeoecology 266, 254-268.
115. VanCappellen P, Berner R (1991) Fluorapatite crystal growth from modified seawater solutions. Geochimica et Cosmochimica Acta 55, 1219-1234.
116. Wierzchos J, Sancho LG, Ascaso C (2005) Biomineralization of endolithic microbes in rocks from the McMurdo Dry Valleys of Antarctica: implications for microbial fossil formation and their detection. Environmental Microbiology 7, 566-575.
117. Wright J, Schrader H, Holser W (1987) Paleoredox variations in ancient oceans recorded by rare earth elements in fossil apatite. Geochimica et Cosmochimica Acta 51, 631-644.
118. Xiao S, Zhang Y, Knoll AH (1998) Three-dimensional preservation of algae and animal embryos in a Neoproterozoic phosphorite. Nature 391, 553-558.
119. Zander HA, Hazen SP, Scott DB (1960) Mineralization of dental calculus. Experimental Biology and Medicine 103, 257-260.
120. Zanin YN, Zamirailova AG (2007) Uranium in supergene phosphorites. Geochemistry International 45, 32-46.
121. Zanin YN, Zamirailova AG (2011) The history of the study of bacterial/cyanobacterial forms in phosphorites. Russian Geology and Geophysics 52, 1134-1139.