Geothermal Thesaurus

Anticlines

An arch-shaped fold in rock in which rock layers are upwardly convex. The oldest rock layers form the core of the fold, and outward from the core progressively younger rocks occur. Anticlines form many excellent hydrocarbon traps, particularly in folds with reservoir-quality rocks in their core and impermeable seals in the outer layers of the fold. A syncline is the opposite type of fold, having downwardly convex layers with young rocks in the core.

Schlumberger - http://www.glossary.oilfield.slb.com/

An aerial oblique photo showing the Zagros Mountains; note the cross-sectional appearance of an anticline exposed by a stream cut.

Courtesy of http://www.fas.org/irp/imint/docs/rst/Sect2/Sect2_6.html

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