Related by context. Frequent words. (Click for all words.) 53 limestone formations 53 slag heaps 52 steep ravines 52 sandstone cliffs 51 escarpments 51 gulches 49 creekbed 49 Carquinez Strait 49 sandstone formations 49 earthen mounds 49 tailing ponds 48 trench dug 48 evaporation ponds 48 cypress swamp 48 rock outcroppings 48 deep gorges 47 ridgetops 47 creek bottoms 47 grassy meadows 47 Sediments 47 Ponderosa pines 47 mine tailings 47 oxbows 47 limestone caves 47 petroglyph 46 granite cliffs 46 dirt berm 46 trestle bridge 46 Alluvial 46 bridge abutments 46 mine shafts 46 loess 46 gravel quarry 46 settling ponds 46 Conemaugh River 46 riparian zones 46 forested wetlands 45 Creek tributary 45 phosphate mines 45 limestone cave 45 streambanks 45 palisades 45 knolls 45 streambeds 45 wooded slopes 45 greenish brown 45 granite boulders 45 tremolite 45 cottonwood trees 45 outcroppings 45 riverbed 45 alluvial deposits 45 coquina 45 limestone cliffs 45 greywacke 45 roadbeds 45 caliche 45 adobes 45 unexploded shells 45 rock outcrops 44 oil derricks 44 mill tailings 44 alluvium 44 chalky white 44 barrens 44 heap leach pads 44 adobe brick 44 hardpan 44 creeks 44 Mineralization occurs 44 muskeg 44 Pend Oreille River 44 gravel pits 44 alfalfa fields 44 ridge tops 44 grassy meadow 44 earthen dams 44 buttes 44 gossans 44 contaminating groundwater 44 heavily polluted 44 deciduous forests 44 escarpment 44 creek 44 rugged cliffs 44 mesas 44 Contaminated soil 44 goldfield 44 limestone 44 creek bed 44 tidal marsh 44 burial mounds 43 palisade 43 landform 43 placer deposits 43 PCBs polychlorinated biphenyls 43 coulees 43 bluffs overlooking 43 cypress swamps 43 dry riverbed 43 loblolly pines