overburden
(geology) The rock and subsoil that lies above a mineral deposit such as a coal seam. / (archaeology) A sterile stratum that lies above the stratum being investigated
The resinous secretion of Myroxylon balsamum, used in cough syrups and perfumery.
A form of coccolithophore having an elliptical ring with arches
A graphical record produced by a kymograph.
掘削が始まる前に、技師たちは石炭層に到達するために除去する必要がある鉱床の上にある岩石や覆土の体積を算出した。
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