Related by context. Frequent words. (Click for all words.) 68 isotope ratios 65 oxygen isotopes 61 isotopic composition 59 lake sediments 59 elemental composition 58 terrestrial ecosystems 58 microfossils 57 marine sediments 57 faunal 56 isotopic 56 abundances 56 radiocarbon dated 55 foraminifera 55 nitrogen fixation 55 otolith 55 zircons 54 preserved fossils 54 radiocarbon 54 arsenate 54 snail shells 53 diatom 53 morphologies 53 aragonite 53 atmospheric methane 53 iron oxides 53 Fig. 1A 52 placental mammals 52 atmospheric CO 52 stromatolites 52 magmas 52 diatoms 52 otoliths 52 spectral signatures 52 Radiocarbon dating 52 chemical composition 52 calcareous 52 systematics 52 sediment cores 52 igneous rocks 52 abiotic 52 coprolites 52 morphologically 52 lichens 51 Quaternary 51 stable isotope 51 biogeochemical 51 angiosperms 51 morphology 51 Dry Valleys 51 temperate forests 51 basalts 51 manganese oxide 51 morphological 51 spherules 51 apatite 50 elegans 50 clathrates 50 basaltic 50 lavas 50 deglaciation 50 unicellular 50 soils 50 spinel 50 marine invertebrates 50 radiocarbon dating 50 fossils 50 Geochemistry 50 lunar soil 50 Early Cretaceous 49 interglacial period 49 pine bark 49 taxa 49 microbiota 49 atmospheric nitrogen 49 paleoclimate 49 isoprene 49 sediments 49 mitochondrial genome 49 planktonic 49 melanosomes 49 methanogens 49 stalagmite 49 olivine 49 osmium 49 resinous 49 greenish brown 49 nanosized 49 coniferous trees 49 copper Cu 49 potassium magnesium 49 Cerling 49 unsaturated fatty acids 49 atmospheric CO2 49 tocopherol 49 acidic soils 49 regolith 49 polymerized 49 interglacial 48 odorants 48 proline 48 Late Cretaceous