eugeogenousadj.
/juːdʒiːˈɒdʒɪnəs/ Geology.
Of rock: that readily decomposes into detritus and is therefore able to form good soil. Opposed to dysgeogenous.
ΚΠ
1850 Phytologist 3 918 The subjacent rocks, with reference to their mode of disintegration, their power of absorption, and their permeability, are divisible essentially into eugeogenous and dysgeogenous. The eugeogenous rocks produce an abundant detritus. When it is of a clayey (pélique) nature, it makes humid stations that are often inundated... The dysgeogenous rocks produce a scanty detritus, sometimes sandy, usually clayey, and always making stations more dry than those of the eugeogenous rocks.
1863 J. G. Baker N. Yorks. Stud. 152 They are due south of the hills of the eugeogenous range and based upon their slope.
1903 Geogr. Jrnl. Aug. 151 Eugeogenous..rocks..yield a plentiful detritus, and the overlying soils are cool and moist.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018).
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adj.1850