undeformed
adjEtymology From un- + deformed.
1
Not deformed.
- Most foreland fold and thrust belts are linear or arcuate belts of folds and thrust faults that form a marginal part of an orogenic belt between an undeformed craton and a more intensely deformed inner zone.1980, B. C. Burchfiel, “Foreland Fold and Thrust Belts—Review”, in AAPG Bulletin, volume 64, number 5, American Association of Petroleum Geologists, →DOI, page 684: