Related by context. Frequent words. (Click for all words.) 68 midden 57 flint tools 57 fossils 57 coprolites 56 intertidal 56 burial mounds 56 microfossils 55 fossilized bones 55 rookeries 55 stromatolites 55 marine invertebrates 55 trilobites 55 barrens 55 prehistoric 55 pottery shards 54 marine reptiles 53 cairns 53 rock outcrops 53 lake sediments 52 marine sediments 52 dinosaur footprints 51 neolithic 51 sediment cores 51 mounds 51 oyster shells 51 archaeologists 51 seamounts 51 seabeds 51 limestone caves 50 oyster shell 50 fossilized remains 50 archeological 50 red ocher 50 lichens 50 archaeological finds 50 marine organisms 50 archeologists 50 sediments 50 salt crystals 50 flints 50 excavated 49 prehistory 49 chert 49 fossil 49 skink 49 burrows 49 archaeological 49 landforms 49 Burgess Shale 49 rocky outcrops 49 dinosaur fossils 48 mosses 48 hydrothermal vents 48 Chaco Canyon 48 petroglyphs 48 hunter gatherers 48 moa 48 fossilized 48 periwinkles 48 molluscs 48 Denisovans 48 reefs 48 radiocarbon dating 48 arrowheads 47 Iron Age 47 dinosaur bones 47 clam shells 47 snails 47 Neolithic 47 invertebrates 47 eel grass 47 petroglyph 47 palaeontologists 47 paleontological 47 oystercatchers 47 compost heaps 47 marl 47 scrub jays 47 archaeological sites 47 tyrannosaur 47 cenotes 47 pictographs 47 sea squirts 47 salt domes 47 carnivorous dinosaurs 47 nests 47 sediment 47 lichen 47 basking sharks 46 calcareous 46 Anthropologists 46 plesiosaur 46 Sperm whales 46 petrified wood 46 hominin 46 Bronze Age 46 animal droppings 46 megafauna 46 excavations 46 Archeologists 46 giant tortoises