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Full Description
There are many books devoted to palaeontology and fossils. However, none have yet dealt with the processes of fossilization, from the formation of the most common fossils to the more exceptional mineralization of animal remains, plants, micro-organisms and even molecules.
Fossilization offers an exhaustive review of fossilization, combining an explanation of the processes involved, reference to the deposits that deliver the different types of fossils, and illustrations of representative specimens. As the exceptional fossiliferous sites of the French territory fully reflect the multitude of cases of fossilization - from the most common to the most original ¬- they are showcased here.
Contents
Foreword ix
Bruno DAVID
Acknowledgments xiii
Chapter 1 General Points 1
1.1 Fossilization: a phenomenon that is always exceptional 1
1.2 The main processes of fossilization 3
1.2.1 Preservation of the endo- or exoskeletal elements 7
1.2.2 Formation of replicas or countermolds 8
1.2.3 Formation of internal molds 9
1.2.4 Case study: geode formation 10
1.3 The concept of a Lagerstätten 13
Chapter 2 Diversity of Types of Mineralization 17
2.1 Silicification 17
2.1.1 Primary silicification 18
2.1.2 Secondary silicification 28
2.2 Carbonization of plants and compressions of cuticles 43
2.2.1 Carbonification due to anoxia 44
2.2.2 Carbonization in connection with forest fires 44
2.2.3 Biogeochemical carbonization (also known as "diagenetic carbonization") 46
2.2.4 Plant compressions 49
2.2.5 Imprints and casts 53
2.3 Carbonatizations and calcitic crystallizations 55
2.3.1 Carbonatization by encrusting and impregnation 55
2.3.2 Carbonatization by percolation and recrystallization 58
2.3.3 Geodes and calcitic outgrowths 61
2.3.4 Crystalline fossils formed of carbonates 65
2.4 Pyritization, limonitization and siderite 67
2.4.1 Pyritization 67
2.4.2 Fossils made of iron oxides or hydroxides 80
2.4.3 Siderite nodules 82
2.5 Amberization 84
2.5.1 Copal 85
2.5.2 Amber 86
2.6 Sulfatization (gypsification and mineralization as barite) 92
2.6.1 Gypsification 93
2.6.2 Mineralization to barite 94
2.7 Phosphatization 95
2.7.1 Phosphateous nodules 95
2.7.2 Phosphorites 96
2.7.3 Crystalline phosphate fossils 97
2.8 Bituminous facies 99
Chapter 3 Remarkable Cases and Fossiliferous Contexts 105
3.1 Burial in fine, layered mud 106
3.1.1 The role of microbial mats in Precambrian and Cambrian shales 106
3.1.2 The role of microbial or algal mats in pelites and lithographic limestones 108
3.1.3 Anoxia of laminar clays bearing plants 112
3.1.4 Diatomites 115
3.2 Accumulations of teeth 118
3.3 Bone beds 121
3.4 Fossilized tracks and trackways 123
3.5 Fossils with anatomical connections 128
3.6 Eggs and trophic traces (bite marks, galls, regurgitations and coprolites) 132
3.7 Land-based palynomorphs: spores and pollen grains 140
3.8 Aquatic palynomorphs 145
3.9 Aquatic microfossils: algae, foraminifera and ostracods 148
Chapter 4 Molecular Preservation 159
4.1 Color fossilization 159
4.1.1 Fossils with preserved colors 160
4.1.2 Fossils where the colors are absent, but can be revealed 165
4.2 Fossilization of the original chemical compositions 166
4.3 Fossilized DNA 167
Conclusion 173
References 175
List of Figures 201
List of Plates 203
List of Authors 209
Index 211
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