Upfolds are called "anticlines," downfolds are called "synclines," and broad downfolded area are known as "basins."

What are Upfolds?

noun. Definition of upfold (Entry 2 of 2) : stratified rocks that are folded upward to a crest : anticline.

What do you call the Upfolds and Downfolds in faulting?

layers of rocks of continental crust bent in upfolds called anticlines & downfolds called synclines.