Page:South African Geology - Schwarz - 1912.djvu/106

 with a short transverse extension is often referred to as a whale-back anticline.

Varieties of folds are of four main types. When the fold is abrupt and angular it is referred to as a knee bend.

When the axis of the fold is inclined, the fold is said to be overfolded. If there is only one limb to the fold the