<P> On a geologic map , synclines are recognized as a sequence of rock layers , with the youngest at the fold 's center or hinge and with a reverse sequence of the same rock layers on the opposite side of the hinge . If the fold pattern is circular or elongate , the structure is a basin . Folds typically form during crustal deformation as the result of compression that accompanies orogenic mountain building . </P>
<P> On a geologic map , synclines are recognized as a sequence of rock layers , with the youngest at the fold 's center or hinge and with a reverse sequence of the same rock layers on the opposite side of the hinge . If the fold pattern is circular or elongate , the structure is a basin . Folds typically form during crustal deformation as the result of compression that accompanies orogenic mountain building . </P>
where are the oldest rocks found in a syncline
where are the oldest rocks found in a syncline
opposite side of the hinge
opposite side of the hinge