An upward fold in rock layers where the oldest rocks are in the center and younger rocks are on the outside, forming an arch-like structure. These folds result from compressional forces in the Earth's crust.
From Greek 'anti' (opposite) and 'klinein' (to lean), literally meaning 'leaning against.' The term was coined in the mid-19th century as geologists developed systematic terminology for describing folded rock structures.
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