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loess (n.)[loess 词源字典]: 1833 (in Lyell), "unstratified deposit of loam," coined 1823 by German mineralogist Karl Cäsar von Leonhard (1779-1862) from German Löss "yellowish-gray soil," from Swiss German lösch (adj.) "loose" (compare German los; see loose). Related: Loessial.[loess etymology, loess origin, 英语词源]
shale (n.): 1747, possibly a specialized use of Middle English schale "shell, husk, pod" (late 14c.), also "fish scale," from Old English scealu (see shell (n.)) in its base sense of "thing that divides or separate," in reference to the way the rock breaks apart in layers. Compare Middle English sheel "to shell, to take off the outer husk" (late 15c.). Geological use also possibly influenced by German Schalstein "laminated limestone," and Schalgebirge "layer of stone in stratified rock."
stratify (v.): 1660s, from French stratifier, from Modern Latin stratificare, from stratum (see stratum). Related: Stratified; stratifying.
epilimnion: "The upper layer of water in a stratified lake", Early 20th century: from epi- 'above' + Greek limnion (diminutive of limnē 'lake').
hypolimnion: "The lower layer of water in a stratified lake, typically cooler than the water above and relatively stagnant", Early 20th century: from hypo- 'below' + Greek limnion (diminutive of limnē 'lake').