Related by context. Frequent words. (Click for all words.) 54 rock outcrops 53 Soil samples 53 granite boulders 52 clasts 52 agates 51 igneous rock 51 granite boulder 50 limestone 50 granite stones 50 marl 50 sandstone formations 50 calcareous 50 decomposed granite 50 kaolinite 50 volcanic rock 50 mudstones 49 stone slabs 49 silts 49 alluvium 49 pine logs 49 outcroppings 49 mussel shells 49 moss covered 49 glacial till 49 basalt 49 walnut shells 49 crushed limestone 49 gravels 49 ironstone 48 sandy loam 48 chert 48 lunar soil 48 quarried 48 feldspar 48 cinnabar 48 moraines 48 stromatolites 48 escarpments 48 pyritic 48 lava tubes 48 sphagnum moss 48 mudstone 48 quartz monzonite 47 metamorphic rocks 47 limestones 47 termite mounds 47 granite cliffs 47 limestone formations 47 basaltic 47 siliceous 47 calcrete 47 locust trees 47 schists 47 Grass clippings 47 tuffs 47 rock outcroppings 47 igneous rocks 46 haematite 46 streambeds 46 chippings 46 andesitic 46 outcrops 46 boulders 46 roadbeds 46 snail shells 46 iron oxides 46 pine bark 46 salt crystals 46 rocky outcrops 46 vuggy silica 45 Reverse circulation 45 silica 45 naturally occurring mineral 45 stalactite 45 talus 45 tussocks 45 railway sleepers 45 greenish brown 45 sedimentary rock 45 sediments 45 laterite 45 siltstones 45 calcite 45 argillite 45 hydrothermally altered 45 sandstone cliffs 45 sandstone 45 intermittent streams 45 petrified wood 45 quicklime 45 placer deposits 45 quartz crystals 45 gossan 44 midden 44 alternating layers 44 trackway 44 alluvial deposits 44 middens 44 zircons 44 scarp 44 tree stumps