While segregation of materials is characteristic of the surficial products of weathering, the opposite tendency, of mixing and aggregation, is the rule under dynamic metamorphism, notwithstanding the minor segregation above noted.
"The Economic Aspect of Geology"
C. K. Leith
Mineral deposits of the "igneous after-effect" type may be profoundly altered through surficial agencies.
"The Economic Aspect of Geology"
C. K. Leith
On the whole, minerals of this mechanically deposited group are not greatly affected by later surficial alteration and concentration, because, having already been subjected to weathering, they are in a condition to resist such influences.
"The Economic Aspect of Geology"
C. K. Leith