The rocks above an unconformity are younger than the rocks beneath (unless the sequence has been overturned). An unconformity represents time during which no sediments were preserved in a region. The local record for that time interval is missing and geologists must use other clues to discover that part of the geologic history of that area. The interval of geologic time not represented is called a hiatus.
An unconformity where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers that may be either vertical or at an angle to the overlying horizontal layers. The whole sequence may later be deformed and tilted by further orogenic activity.
Uranium Star Acquires Option for a 50% Interest in Athabasca-Type Unconformity-Gold-Uranium-Copper-Mineralization Property
Sep 26, 2007; TORONTO, ONTARIOMarketwire - Sept. 26, 2007) - Uranium Star (OTCBB:URST)(FRANKFURT:YE5) is pleased to announce that it has...
Discussion on Evidence for a Major Neoproterozoic Orogenic Unconformity within the Dalradian Supergroup of NW Ireland/ Ian Alsop & Donny Hutton Reply
Jan 01, 2005; Journal, Vol. 161, 2004, pp. 629-641. Geoff Tanner writes: Firstly, I would like to congratulate the authors for presenting a...