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Greensand
Greensand or Green sand is either a sand or sandstone, which has a greenish color. This term is specifically applied to shallow marine sediment, that contains noticeable quantities of rounded greenish grains. These grains are called ''glauconies'' and consist of a mixture of mixed-layer clay minerals, such as smectite and glauconite mica. Greensand is also loosely applied to any glauconitic sediment.〔Odin, G.S., ed. (1988). ''Green Marine Clays.'' Developments in Sedimentology no. 45. Elsevier, Amsterdam. 445 p. ISBN 978-0-444-87120-6〕〔"Pettijohn F. J., P. Potter, and R. Siever (1987) Sand and sandstone. New York, NY: Springer-Verlag."〕〔Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, J.A., eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. ISBN 0-922152-76-4〕
==Formation==
Greensand forms in anoxic marine environments that are rich in organic detritus and low in sedimentary input.〔 Having accumulated in marine environments, greensands can be fossil-rich, such as in the late-Cretaceous deposits of New Jersey, USA.〔Dale A. Russell, ''An Odyssey in Time'' (Toronto: University of Toronto Press, 1989), pp. 137-9.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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