2 adjectives to describe col

The crumbling spurs and battlements of Red Mountain bound it on the north, the somber, rudely sculptured precipices of Black Mountain on the south, and a hacked, splintery col, curving around from mountain to mountain, shuts it in on the east.

Further round, over the wooded "cols" that guard the "Pique" valley,

2 adjectives to describe  col