Definitions and images to illustrate geological terms, links to images and website articles


schematic of an anticlineAnticlines are upwardly convex folded structures that form arches with the youngest (last deposited) strata at the hinge.

Anticlines are A-shaped structures that develop during crustal deformation as the result of compression that accompanies orogenic mountain building.

(images at left - click to enlarge - top, schematic of an anticline; botttom, road cut exposure of anticlinal fold with syncline to right)

road cut exposure of anticlinal fold (with syncline at right)

Anticlines are of particular interest to oil-exploration geologists because the Earth's largest oilfields occur in large, gentle anticlines in thick sedimentary rock sequences.

Click here for an image that shows an anticline with a hinge that has a flat top and two steep limbs, creating a box-like shape. Folds with this shape are called box folds. Both synclines and anticlines can be box folds.

[links: images: formations: anticline; anticline and syncline near Calico Ghost Town, Yermo, California; anticline; Teton anticline; anticline; satellite: anticlines near Paradox, UT, and anticline crossed by transverse stream, and Uncompahgre uplift; plunging anticlines and synclines north of Moab, UT; plunging anticlines and synclines, Dinosaur National Monument, UT]

Labels: ,

. . . evolving since 01/07/07