Basics--Folds Table

Type of Fold	Definition	Appearance of Beds in Map View
anticline	up fold	roughly parallel stripes dip away from center (away from axis) oldest at center (along axis) youngest farthest from center
plunging anticline	up fold with tilted axis	roughly a U-shaped pattern plunges in direction U points oldest at center (along axis) youngest farthest from center
syncline	down fold	roughly parallel stripes dip toward center (toward axis) oldest farthest from center youngest at center (along axis)
plunging syncline	down fold with tilted axis	roughly a U-shaped pattern plunges in direction U opens oldest farthest from center youngest at center (along axis)
monocline	strata tilted in one direction	all dip in same direction
structural dome	upward bulge in layered rocks	roughly a bull's eye pattern dip away from center oldest in center youngest farthest from center
structural basin	downward bulge in layered rocks	roughly a bull's eye pattern dip toward center youngest in center oldest farthest from center