Isoclinal antiformal fold in Paleozoic quartzite, Naxos, Greece. The axial plane of the fold dips steeply to the right. Both limbs of the fold also dip to the right (thus making it an isoclinal fold), and therefore one of the limbs must be overturned. The steeper dipping limb is most likely overturned, but the lack of primary sedimentary structures makes this interpretation conjectural. The geologist is measuring the strike and dip of bedding on the right limb of the fold. The fold hinge is subhorizontal. Photo credit: Roy W. Schlische.