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A syncline is a fold of rocks with younger rock layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline.
Development of a mountain range by sedimentation of a geosyncline and isostatic uplifting. This is the "collapse" of the geosyncline. A geosyncline (originally called a geosynclinal) is an obsolete geological concept to explain orogens, which was developed in the late 19th and early 20th centuries, before the theory of plate tectonics was envisaged.
See the main article on folds for a fuller treatment of fold types and nomenclature but in brief, an anticline is an arch-like fold whereas a syncline is its converse; a downfold. Antiforms , anticlinoria , synforms and synclinoria are variations on these.
Syncline: linear, strata normally dip toward the axial center, youngest strata in center irrespective of orientation. Antiform: linear, strata dip away from the axial center, age unknown, or inverted. Synform: linear, strata dip toward the axial center, age unknown, or inverted.
Cross-sectional diagram of an anticline Anticline exposed in road cut (small syncline visible at far right). Note the man standing in front of the formation, for scale. New Jersey, U.S. In structural geology, an anticline is a type of fold that is an arch-like shape and has its oldest beds at its core, whereas a syncline is
Syncline, in structural geology, a syncline is a fold, with younger layers closer to the center of the structure. Synclinal, in alkane stereochemistry, a torsion angle between 30° to 90° and –30° to –90°
Sideling Hill is a syncline mountain, in a region of downward-folded rock strata between two upfolded anticlines. The ridge is capped by an erosion-resistant conglomerate and sandstone of Mississippian (early Carboniferous ) geologic age, the Purslane Sandstone of the Pocono Formation .
The Chuar Syncline is a doubly plunging fold, which means that along the hingeline within the axis of the syncline, beds in some areas (Nankoweap Canyon) dip toward the south, and in other areas (Lava Chuar Canyon), beds dip toward the north.