A given rock may be undergoing katamorphism while rocks on either side at the same depth are suffering anamorphism.
"The Economic Aspect of Geology"
C. K. Leith
By katamorphism rocks break down to produce the surficial rocks, and by anamorphism the surficial rocks are again consolidated and altered to produce highly crystalline rocks, which are not dissimilar in many of their characteristics to the igneous rocks from which all rocks trace their ultimate origin.
"The Economic Aspect of Geology"
C. K. Leith
In Brazil, the ores have undergone close folding and anamorphism.
"The Economic Aspect of Geology"
C. K. Leith