Related by context. Frequent words. (Click for all words.) 60 zircons 55 radiocarbon 55 lavas 52 fossils 52 stromatolites 51 microfossils 51 apatite 51 isotopic 50 ppm U 50 foraminifera 50 Radiocarbon dating 49 sedimentary rock 49 Late Cretaceous 49 sedimentary basins 49 assay intervals 48 Precambrian 48 Otzi 48 sedimentary rocks 48 olivine 48 samples assayed 48 marine sediments 48 coprolites 47 lake sediments 47 Carboniferous 47 radiocarbon dating 47 osmium 47 sediments 47 igneous 47 morphologies 47 Lower Cretaceous 47 sulphide minerals 47 continental crust 47 siliceous 47 calcareous 46 lithologies 46 spherules 46 silicates 46 interglacial 46 Grab samples 45 trilobites 45 kimberlitic 45 sulphide zones 45 mineralized intercepts 45 biotite 45 nuclei 45 iron oxides 45 geochemical 44 sulphide bearing 44 radiometric anomalies 44 lunar soil 44 Cretaceous 44 caustic fusion 44 glaciation 44 flint tools 44 sample pulps 44 interglacial period 43 Eocene 43 crystalline structure 43 geologically 43 pathfinder elements 43 dinosaur footprints 43 NQ core 43 papyri 43 taxa 43 Mesozoic 43 amphorae 43 column leach 43 mineralogical 43 Cretaceous Period 43 Paleocene 43 Pleistocene 42 geologic 42 Niobium 42 drill holes 42 melanosomes 42 anomalous zones 42 supercontinent 42 dinosaur fossils 42 Burgess Shale 42 ejecta 42 particle sizes 42 middens 42 stalagmites 42 Fossils 42 fossilized 42 landforms 42 Ordovician 42 meteorites 42 Mesolithic 42 fossilized bones 42 salt crystals 42 Geological mapping 42 mineralogy 42 stalagmite 41 diatoms 41 crystals 41 fossil 41 europium 41 assays 41 trench sampling 41 planetary nebulae