Synclinal

[Sarah]

Formed by strata dipping toward a common line or plane; as, asynclinal trough or valley; a synclinal fold; -- opposed toanticlinal.

[Utpal Shuvro]

sloping downward toward each other to create a trough

[VikaRip]

Synclinal refers to a downward curving fold or alignment in stratified rocks, creating a structure that is concave upwards where younger layers are closer to the center. It is typically seen in geology and is opposite to anticlinal.

[sastergri]

inclined downward from opposite directions, so as to meet in a common point or line

[Magaret]

Describing a torsion angle between 30° and 90°