Definition of upfold in English:
- They may have a combination of upfolds and downfolds resulting in very complex structures.
- The folded rocks are seen in exposed and submerged nearshore reefs, and cliffed headlands where upfolds bring the harder Black Rock Sandstone above sea level.
- The upfolds that occur become mountains (these upfolds are called anticlines) and the down folds are called synclines.
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