Related by context. Frequent words. (Click for all words.) 63 Younger Dryas 60 mass extinction 60 Cambrian explosion 58 Carboniferous 58 Ordovician 58 Late Cretaceous 58 Quaternary 57 marine sediments 57 terrestrial ecosystems 57 interglacial period 57 volcanism 57 Cretaceous Period 56 atmospheric methane 56 Precambrian 55 interglacial 55 Pliocene 55 multicellular 55 megafauna 55 foraminifera 55 mass extinctions 54 glaciation 54 depositional 54 Pleistocene 53 Cretaceous 53 anoxic 53 Paleocene 52 Burgess Shale 52 Oligocene 52 planktonic 52 Eocene 52 stromatolites 52 supercontinent 51 Holocene 51 isotopic composition 51 PETM 51 Triassic 51 Mesozoic 51 Cyanobacteria 51 prokaryotes 51 Chicxulub 51 hydrological cycle 51 atmospheric CO 51 magmatic 51 abundances 51 Antarctic ozone 50 Proterozoic 50 decadal 50 extinctions 50 mid latitudes 50 Geochemistry 50 crustal 50 Little Ice Age 50 microfossils 50 diatoms 50 olivine 50 solar nebula 50 basaltic 50 basalts 50 continental crust 49 clades 49 Supplementary Fig 49 biodiversity hotspots 49 lithosphere 49 diatom 49 hydrothermal 49 lake sediments 49 vertebrate species 49 biosphere 49 multicellular organisms 49 biogenic 49 Lower Cretaceous 48 CO2 concentrations 48 carbonaceous 48 Paleozoic 48 poleward 48 lavas 48 Archaea 48 magnetic reconnection 48 trilobites 48 anthropogenic 48 single celled 48 hydrothermal vent 48 eukaryotes 48 Sediments 48 Pleistocene era 47 sediment cores 47 species extinctions 47 atmospheric CO2 47 GPa 47 taxa 47 gigatonnes 47 nitrogen fixation 47 atmospheric carbon dioxide 47 planetary nebula 47 Medieval Warm Period 47 volcanically active 47 tuffs 47 eukaryotic 47 mineralizing 47 abiotic 46 Pacific Decadal Oscillation