saddle reef
noun
University
1
A mineral deposit associated with the crest of an anticlinal fold and following the bedding planes, usually found in vertical succession, especially the gold-bearing quartz veins of Australia.
2
An opening at the crest of a sharp fold in sedimentary rocks, occupied by ore.
3
A saddle-shaped bedded mineral (usually gold-bearing quartz) vein occurring along the crest of an anticline or (less common) a syncline (an inverted saddle).