Related by context. Frequent words. (Click for all words.) 65 sediment samples 59 Soil samples 55 sediment cores 52 sediments 50 lake sediments 50 sediment sampling 49 middens 49 samples 49 Sediments 49 coprolites 48 bathymetry 48 sediment 48 Specimens 48 stromatolites 47 marine sediments 47 microfossils 47 Radiocarbon dating 46 foraminifera 46 Geochemical 46 Grab samples 46 specimens 45 outfalls 45 pottery shards 44 scrapings 44 excavated 44 flint tools 44 fossils 44 tissue samples 44 limestone caves 43 borings 43 glacial till 43 Geochemistry 43 drainage basins 43 intertidal 43 Sediment 43 radiocarbon 42 gravels 42 bird carcasses 42 geochemistry 42 samplings 42 Tissue samples 42 Hydrologists 42 zircons 42 contaminants 42 oxygen isotopes 42 biota 42 spherules 42 aerial photographs 42 Contaminants 42 swab samples 42 rock outcrop 41 basalt 41 microscopic organisms 41 soil borings 41 Geological mapping 41 geochemical 41 Fossils 41 kimberlitic 41 isotopic composition 41 contaminated sediments 41 radiocarbon dating 41 petrified wood 41 fragments 40 artesian wells 40 salt crystals 40 headwater streams 40 Quaternary 40 basaltic 40 lunar soil 40 drill cuttings 40 Toxic chemicals 40 marine invertebrates 40 alluvial deposits 40 Measurements 40 transects 40 pollutants 40 landforms 40 lavas 40 serum samples 40 geological formations 40 streambeds 40 geologic 40 Samples 40 outcrops 40 geomorphology 39 polluted groundwater 39 moraines 39 tiny specks 39 Paleocene 39 transect 39 Biologists 39 sedimentary rock 39 dredged material 39 silt 39 invertebrates 39 archaeological excavations 39 collected 39 Extensive searches 39 sandstones 39 fossilized bones 39 shorelines