THE ROLE OF DECAY AND MINERALIZATION IN THE PRESERVATION OF SOFT-BODIED FOSSILS

▪ Abstract Fossil deposits that preserve soft-bodied organisms provide critical evidence of the history of life. Usually, only more decay resistant materials, e.g., cuticles, survive as organic remains as a result of selective preservation and subsequent diagenesis to more resistant biopolymers. Permineralization, the permeation of tissues by mineralizing fluids, may preserve remarkable detail, particularly of plants. However, evidence of more labile tissues, e.g., muscle, normally requires the replication of their morphology by rapid in situ growth of minerals, i.e., authigenic mineralization. This process relies on the steep geochemical gradients generated by decay microbes. The minerals involved, and the level of detail preserved (which may be subcellular), depend on a number of factors, including the nature of microbial activity and amount of decay, availability of ions, and the type of organism that is fossilized. Understanding these controls is essential to determining the conditions that favor exce...

[1]  H. Pauwels,et al.  Chemical diagenesis in coastal marine sediments , 1989 .

[2]  D. Briggs,et al.  Fossilization of Soft Tissue in the Laboratory , 1993, Science.

[3]  Derek E. G. Briggs,et al.  Phosphatization of soft-tissue in experiments and fossils , 1993, Journal of the Geological Society.

[4]  R. Raiswell,et al.  Pyritization of soft-bodied fossils: Beecher's Trilobite Bed, Upper Ordovician, New York State , 1991 .

[5]  J. Morse,et al.  Factors Influencing the Grain Size Distribution of Authigenic Minerals , 1996, American Journal of Science.

[6]  P. Wilby,et al.  Taxonomic trends in the resolution of detail preserved in fossil phosphatized soft tissues , 1997 .

[7]  A. Scott,et al.  The Formation and Significance of Carboniferous Coal Balls , 1985 .

[8]  P. Forey,et al.  Conodont affinity and chordate phylogeny , 2000, Biological reviews of the Cambridge Philosophical Society.

[9]  P. Finch,et al.  Resistant biomacromolecules in the fossil record , 1995 .

[10]  D. Briggs,et al.  The taphonomy and affinities of the problematic fossil Myoscolex from the Lower Cambrian Emu Bay Shale of South Australia , 1997, Journal of Paleontology.

[11]  S. Morris,et al.  Solnhofen : a study in Mesozoic palaeontology , 1994 .

[12]  R. Evershed,et al.  Chemical preservation of insect cuticle from the Pleistocene asphalt deposits of California, USA , 1997 .

[13]  P. Wilby,et al.  Phosphatized soft tissues in bivalves from the Portland Roach of Dorset (Upper Jurassic) , 1995, Geological Magazine.

[14]  N. Butterfield.  Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale , 1990, Paleobiology.

[15]  S. Gabbott,et al.  Preservation of fossils in clay minerals; a unique example from the Upper Ordovician Soom Shale, South Africa , 2001 .

[16]  F. Westall,et al.  Microfossils and Paleoenvironments in Deep Subsurface Basalt Samples , 2000 .

[17]  B. Jørgensen,et al.  Manganese, iron and sulfur cycling in a coastal marine sediment, Aarhus bay, Denmark , 1994 .

[18]  Max Maurer,et al.  Kinetics of biologically induced phosphorus precipitation in waste-water treatment , 1999 .

[19]  D. Briggs,et al.  Decay and mineralization of shrimps , 1994 .

[20]  S. Gabbott.  Orthoconic cephalopods and associated fauna from the late Ordovician Soom Shale Lagersta¨tte, South Africa , 1999 .

[21]  M. Schoonen,et al.  Reactions forming pyrite and marcasite from solution: I. Nucleation of FeS2 below 100°C , 1991 .

[22]  Paul Bernier,et al.  Role of microbial mats in the fossilization of soft tissues , 1996 .

[23]  Orr,et al.  Cambrian burgess shale animals replicated in clay minerals , 1998, Science.

[24]  P. Allison,et al.  Burgess Shale biotas: burrowed away? , 1993 .

[25]  N. Trewin,et al.  Geological setting of the Early Devonian Rhynie cherts, Aberdeenshire, Scotland: an early terrestrial hot spring system , 2002, Journal of the Geological Society.

[26]  R. Evershed,et al.  Alternative origin of aliphatic polymer in kerogen , 2000 .

[27]  J. Wheeler.  Evolution and present situation of the South American Camelidae , 1995 .

[28]  P. Allison,et al.  Taphonomy of Nonmineralized Tissues , 1991 .

[29]  A. Knoll,et al.  Nondestructive, in situ, cellular-scale mapping of elemental abundances including organic carbon in permineralized fossils , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[30]  Philip J. Demaris.  Formation and distribution of coal balls in the Herrin Coal (Pennsylvanian), Franklin County, Illinois Basin, USA , 2000, Journal of the Geological Society.

[31]  J. Gehling.  Microbial mats in terminal Proterozoic siliciclastics; Ediacaran death masks , 1999 .

[32]  W. S. Fyfe,et al.  Metallic ion binding by Bacillus subtilis; implications for the fossilization of microorganisms , 1988 .

[33]  Jean-François Gaillard,et al.  Biogeochemical dynamics in aquatic sediments , 1996 .

[34]  J. Sepkoski,et al.  Biodiversity: Past, Present, and Future , 1997, Journal of Paleontology.

[35]  Alison A. Henwood.  Exceptional preservation of dipteran flight muscle and the taphonomy of insects in Amber , 1992 .

[36]  D. Briggs,et al.  Decay of Branchiostoma: implications for soft‐tissue preservation in conodonts and other primitive chordates , 1993 .

[37]  Deg Briggs,et al.  Palaeobiology: A Synthesis , 1992 .

[38]  D. Briggs,et al.  The anatomy of conodonts , 1993 .

[39]  R. Raiswell,et al.  Controls on the pyritization of exceptionally preserved fossils; an analysis of the Lower Devonian Hunsrueck Slate of Germany , 1996 .

[40]  G. Colbath.  Jaw mineralogy in eunicean polychaetes (Annelida) , 1986 .

[41]  D. Briggs.  Molecular taphonomy of animal and plant cuticles: selective preservation and diagenesis , 1999 .

[42]  R. D. Guthrie,et al.  Frozen Fauna of the Mammoth Steppe: The Story of Blue Babe , 1989 .

[43]  D. Grimaldi,et al.  Electron Microscopic Studies of Mummified Tissues in Amber Fossils , 1994 .

[44]  D. Briggs,et al.  A new exceptionally preserved biota from the Lower Silurian of Wisconsin, U.S.A. , 1985 .

[45]  A. Scott,et al.  New data on the formation of Carboniferous coal balls , 1996 .

[46]  B. Stankiewicz,et al.  Taphonomy of the insects from the Insect Bed (Bembridge Marls), late Eocene, Isle of Wight, England , 1998, Geological Magazine.

[47]  M. Sutton.  A three-dimensionally preserved fossil polychaete worm from the Silurian of Herefordshire, England , 2001, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[48]  P. Orr,et al.  Exceptionally preserved conchostracans and other crustaceans from the Upper Carboniferous of Ireland , 1999 .

[49]  D. Siveter,et al.  Three‐dimensional preservation of a non‐biomineralized arthropod in concretions in Silurian volcaniclastic rocks from Herefordshire, England , 2000, Journal of the Geological Society.

[50]  S. Mann,et al.  Crystal tectonics: chemical construction and self-organization beyond the unit cell , 2000 .

[51]  D. Briggs,et al.  Fossilization of feathers , 1995 .

[52]  A. Seilacher,et al.  Sedimentological, ecological and temporal patterns of fossil Lagerstätten , 1985 .

[53]  R. Evershed,et al.  Chitin in the fossil record: Identification and quantification of D-glucosamine , 2001 .

[54]  J. Hubert,et al.  Apatite genesis: A biologically induced or biologically controlled mineral formation process? , 1990 .

[55]  Derek E. G. Briggs,et al.  Decay and preservation of polychaetes: taphonomic thresholds in soft-bodied organisms , 1993, Paleobiology.

[56]  Derek E. G. Briggs,et al.  The biomolecular paleontology of continental fossils , 2000, Paleobiology.

[57]  Harold McGee,et al.  On Food and Cooking: The Science and Lore of the Kitchen , 1984 .

[58]  D. Briggs,et al.  New arthropods from the Lower Devonian Hunsru¨ck Slate (Lower Emsian, Rhenish Massif, western Germany) , 2001 .

[59]  S. Morris.  The community structure of the Middle Cambrian Phyllopod Bed lBurgess Shaler , 1986 .

[60]  G. A. Carson.  Silicification of Fossils , 1991 .

[61]  J. M. Schopf.  Modes of fossil preservation , 1975 .

[62]  P. Allison.  Konservat-Lagerstätten: cause and classification , 1988, Paleobiology.

[63]  D. Donovan,et al.  Decay and mineralization of non-mineralized tissue in coleoid cephalopods , 1995 .

[64]  A. Seilacher.  Biomat-related lifestyles in the Precambrian , 1999 .

[65]  P. Wilby,et al.  The role of the calcium carbonate-calcium phosphate switch in the mineralization of soft-bodied fossils , 1996, Journal of the Geological Society.

[66]  D. Briggs,et al.  The conodont animal , 1983 .

[67]  D. Grimaldi,et al.  A Triassic Lagerstätte from eastern North America , 1996, Nature.

[68]  R. Parkes,et al.  Understanding fossilization: Experimental pyritization of plants , 2001 .

[69]  D. Canfield,et al.  Pathways of organic carbon oxidation in three continental margin sediments. , 1993, Marine geology.

[70]  R. E. Allen.  Role of diffusion–precipitation reactions in authigenic pyritization , 2002 .

[71]  D. Martill.  Macromolecular resolution of fossilized muscle tissue from an elopomorph fish , 1990, Nature.

[72]  G. Pinna.  Exceptional preservation in the Jurassic of Osteno , 1985 .

[73]  L. Margulis,et al.  On the experimental silicification of microorganisms II. On the time of appearance of eukaryotic organisms in the fossil record , 1978 .

[74]  R. Parkes,et al.  Controls on the formation of authigenic minerals in association with decaying organic matter: an experimental approach , 1999 .

[75]  N. Butterfield.  Leanchoilia guts and the interpretation of three-dimensional structures in Burgess Shale-type fossils , 2002, Paleobiology.

[76]  S. Gabbott,et al.  A giant conodont with preserved muscle tissue from the Upper Ordovician of South Africa , 1995, Nature.

[77]  Jillian F. Banfield,et al.  Geomicrobiology : interactions between microbes and minerals , 1997 .

[78]  S. Derenne,et al.  A reappraisal of kerogen formation , 1989 .

[79]  I. Butler,et al.  Fossil plants from the Eocene London Clay: the use of pyrite textures to determine the mechanism of pyritization , 2002, Journal of the Geological Society.

[80]  P. Allison,et al.  Exceptional fossil record: Distribution of soft-tissue preservation through the Phanerozoic , 1993 .

[81]  R. Petrovich.  Mechanisms of Fossilization of the Soft-Bodied and Lightly Armored Faunas of the Burgess Shale and of Some Other Classical Localities , 2001 .

[82]  J. Kluessendorf.  Predictability of Silurian Fossil-Konservat-Lagerstatten in North America , 1994 .

[83]  D. Briggs,et al.  Decay and mineralization of mantis shrimps (Stomatopoda; Crustacea); a key to their fossil record , 1997 .

[84]  D. Martill,et al.  Morphologic and spectral investigation of exceptionally well-preserved bacterial biofilms from the Oligocene Enspel formation, Germany , 2002 .

[85]  P. Wilby,et al.  Soft tissue preservation in the Sinemurian of Osteno, Italy - Comparisons with Solnhofen and with experimental results , 1995 .

[86]  P. Wilby,et al.  The mineralization of dinosaur soft tissue in the Lower Cretaceous of Las Hoyas, Spain , 1997, Journal of the Geological Society.

[87]  S. Morris,et al.  Middle Cambrian Polychaetes from the Burgess Shale of British Columbia , 1979 .

[88]  Andrew Steele,et al.  The simulated silicification of bacteria--new clues to the modes and timing of bacterial preservation and implications for the search for extraterrestrial microfossils. , 2002, Astrobiology.