interstratified seam

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sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
Coal Measures — British coalfields in the nineteenth century. The Coal Measures is a lithostratigraphical term for the coal bearing part of the Upper Carboniferous System. It represents the remains of fluvio deltaic sediment, and consists mainly of clastic rocks … Wikipedia

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