synclinal.

/sin-klahyn-l, sing-, sing-kli-nl/US // sɪnˈklaɪn l, sɪŋ-, ˈsɪŋ klɪ nl //

同轴心,同轴心的,同轴线,同轴心的人

Definitions

1.
- ›sloping downward from opposite directions so as to meet in a common point or line.
- ›Geology. inclining upward on both sides from a median line or axis, as a downward fold of rock strata.pertaining to such a fold.

Many such synclinal mountains or plateaus, separated by narrower anticlinal valleys, occur throughout the Appalachians.
The high synclinal coal-field forms the most important feature of the north of the county.
Take, for example, one of the synclinal folds in the Appalachian chain.
If an anticlinal arch be a weak structure, a synclinal arrangement of strata is quite the opposite.
Synclinal strata therefore endure, while anticlinal strata are worn more readily away.