Grid ref: H096465. The rocks of this sinkhole consist of Dartry Limestone, Knockmore Limestone and chert. The site has been designated a PASSI. Little Reyfad is at the base of a shakehole. A series of descents (7 m) leads to a floor of broken chert, followed by a further 3 metre difficult descent to another base, which is blocked with a rock and gravel.