the junction between two parallel series of stratified rocks, representing a considerable period of erosion of the much older underlying rocks before the more recent ones were deposited
disconformity in American English
(ˌdɪskənˈfɔrməti; ˈdɪskənˈfɔrməti)
noun
1. Archaic
lack of conformity
2. Geology
a type of unconformity with parallel layers of rock strata