Related by context. Frequent words. (Click for all words.) 60 microfossils 60 marine sediments 59 Early Cretaceous 58 cretaceous 58 Archaean 58 Geochemistry 58 loess 57 lake sediments 56 radiocarbon dated 56 igneous rocks 56 metamorphic rocks 55 calcareous 55 apatite 55 preserved fossils 55 Cenozoic 55 biogeochemical 55 Carboniferous 55 Upper Cretaceous 54 isotope ratios 54 lavas 54 faunal 54 Lower Cretaceous 53 monazite 53 Upper Jurassic 53 isotopic composition 53 Paleoanthropology 53 embayment 53 siliceous 53 clasts 53 Paleocene 53 Palaeontology 53 zircons 52 sulfide minerals 52 Late Cretaceous 52 Tarim Basin 52 gneisses 52 manganese oxide 52 stromatolites 52 sedimentary 52 stratiform 52 sediment cores 51 Late Triassic 51 hydrothermal vent 51 limestone caves 51 geochemists 51 mudstone 51 Eocene 51 geochemical 51 fossils 51 clastic 51 Cretaceous 51 goethite 51 magmas 51 kaolinite 51 basaltic 51 fossil 51 aragonite 50 mudstones 50 biogeochemistry 50 geochemical samples 50 intrusives 50 radiocarbon dates 50 oxygen isotopes 50 sedimentary rocks 50 geochemistry 50 sediments 50 Quaternary 50 metamorphism 50 Vibrio cholerae 50 massive sulphide deposits 50 hydrothermal fluids 50 depositional 50 placer deposits 50 tuffs 50 Mesozoic 50 basalts 50 Geological mapping 50 Burgess Shale 50 stockwork veining 50 igneous 49 carbonatite 49 Vertebrate 49 diatom 49 hydrothermal activity 49 quartzites 49 otolith 49 abiotic 49 naturally occurring mineral 49 Geologically 49 morphologies 49 Upper Paleolithic 49 alluvial deposits 49 Heruga 49 mitochondrial genome 49 dacite 49 Ag Au 49 medullary bone 49 Ordovician 49 temperate forests 49 jasperoid 49 continental crust