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| isbn = 0891810609
| isbn = 0891810609
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[[File:ST53_Part01_Pg03A.jpg|thumb|300px]]
Folds are bends or flexures of layered rock that form in response to motion along [[fault]]s, [[diapirism]], [[compaction]], and regional subsidence or [[uplift]]. Folds are expressed in [[seismic reflection profile]]s as one or more regions of dipping reflections ([[dip]] domains) that correspond to inclined [[stratigraphic]] contacts.
[[File:ST53_Part01_Pg03B.jpg|thumb|300px]]
Dip domains are separated by [[axial]] surfaces; imaginary planes which, when viewed in two dimensions, form axial traces. [[Anticlinal]] axial surfaces occupy concave-downward [[fold hinge]]s; [[synclinal]] axial surfaces occupy concave-upward fold hinges.