Ключевые слова: archaeological, bucket, calcium, carbonate, chalk, chalky, clay, deposits, digging, dredging, dump, ecology, equipment, escarpment, excavation, excavators, exploiting, extraction, fossil, geological, geology, heavy, hills, industrial, industry, limestone, low, lowland, machinery, mineral, mining, pit, production, quarry, resources, rocky, scarp, slope, transport, work,