单词	gyttja
释义	gyttja /ˈjɪtʃə / noun [mass noun] Geology Sediment rich in organic matter deposited at the bottom of a eutrophic lake.The organic-rich bottom deposits (sapropels or gyttja) are rich in oil-producing organic compounds.... Incorporation of old carbon into basal gyttja yields ages from bulk samples that are initially about 600 yr too old. All laboratory tests were performed on 19 samples of gyttja and lacustrine chalk taken from the lakelands. Origin Late 19th century: Swedish, literally 'mud, ooze'.
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