An unconformable contact between two geological units in which the bedding of the
older, underlying unit is parallel to the bedding of the younger, overlying unit,
but in which the contact between the two units is marked by an irregular or uneven
surface of appreciable relief.
Neuendorf, K.K.E, Mehl, J.P. & Jackson, J.A. (eds), 2005. Glossary of geology, 5th
Edition. American Geological Institute, Alexandria, 779 p.