Geologically, Chestnut Ridge is a doubly plunging anticline.
2.
An anticline which plunges at both ends is termed a doubly plunging anticline, and may be formed from multiple deformations, or superposition of two sets of folds.
3.
In case of Bombay High, the structure is a " north-northwest to south-southeast trending doubly plunging Anticline with a faulted east limb ", 65 km long and 23 km wide ", and is the most probable reason to call it " Bombay High ".