Ball clay An extremely plastic, fine grained sedimentary clay, which may contain some organic matter.
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North of this lies a band of sedimentary alluvium, clay, limestone, and sandstone.
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Sedimentary rock such as alluvium, clay, limestone, and sandstone forms the greatest share of the Far North's geology.
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Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanicash through low-grade regional metamorphism.
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Density contrasts between different sedimentary layers, such as between sand and clay, can result in flame structures or load casts, formed by inverted diapirism.
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In most sedimentary rocks, mica, feldspar and less stable minerals have reacted to clay minerals like kaolinite, illite or smectite.
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Clay minerals are very common in fine grained sedimentary rocks such as shale, mudstone, and siltstone and in fine grained metamorphic slate and phyllite.