About the Cover
ON COVER - The Canyonlands grabens, Utah, form an active extensional fault array comprising segmented normal faults (shadowed), linked by both relay and breached relay ramp structures. Growth of this complex fault array by segment linkage has resulted in major changes in the stream drainages across the area through processes of stream capture and diversion. The grabens are an excellent analog for examining structural trap development and controls on reservoir distribution within larger scale fault systems in the subsurface. The article by Dutton and Trudgill on p. 763 of this issue discusses a complex relay system within an analogous salt-detached fault array, offshore Angola. Photo by Bruce Trudgill.
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Copyright © 2009 by American Association of Petroleum Geologists (AAPG)
