Related by context. Frequent words. (Click for all words.) 57 mammoth tusk 56 ichthyosaur 55 fossilized skull 55 concretions 53 Bone fragments 53 tetrapod 53 braincase 52 uraninite 52 theropod 52 hadrosaur 51 fossilized skeleton 51 sedimentary layers 51 Radiocarbon dating 51 concretion 51 trilobite 51 Fossilized 51 hyoid bone 51 periosteum 51 A. afarensis 51 arcuate 51 dentine 50 snail shells 50 Gigantoraptor 50 elemental composition 50 lithic 50 maxilla 50 carnivorous dinosaur 50 Early Cretaceous 50 Palaeontologists 49 marine reptile 49 skull fragment 49 basalt rock 49 otolith 49 flatworm 49 laminae 49 stalactite 49 lipoma 49 forelimb 49 nanosized 49 microdiamonds 49 lunar craters 49 H. floresiensis 49 blebs 49 mosasaur 48 horned dinosaurs 48 encrustation 48 tyrannosaur 48 elastic fibers 48 dinosaur species 48 Scientists theorize 48 horned dinosaur 48 petrographic 48 aragonite 48 fossil specimens 48 dinosaur fossil 48 lunar soil 48 microstructural 48 microfossils 48 threadlike 48 trimer 48 clasts 48 DNA helix 48 tusk 48 Siberian permafrost 48 Neandertal 47 plesiosaur 47 fossa 47 radiographically 47 microfabricated 47 Microscopic 47 fossilized 47 Albertosaurus 47 magnetic particle 47 Gusev crater 47 force microscopy AFM 47 sea scorpion 47 skull fragments 47 grayish white 47 predatory dinosaurs 47 lamina 47 snail shell 47 bony plates 47 red ocher 47 membranous 47 scanning electron microscopes 47 canine tooth 47 Otzi 47 lamellar 47 peccary 47 ANI Archaeologists 47 Jurassic era 47 Ardipithecus ramidus 47 cambium 47 protein fragment 47 fossils 46 scanning electron microscopy 46 wormlike 46 diverticulum 46 radiocarbon dated 46 Shewanella 46 otoliths