AAPG Bulletin (1995, April) Cover Photo by G. Shanmugam and T. Straume: Lysefjord at Pulpit Rock, southern Norway

AAPG Bulletin (1995, April, v. 79, No. 4)

           Caption: The imposing cliff, composed of Proterozoic metasediment, towers nearly 600 m above Lysefjord at Pulpit Rock, southern Norway. The fjord with steep cliffs was caused by glacial erosion. The inset core photograph (10 cm wide) shows fine-grained sandstone with rafted reddish brown mudstone clasts near the top of the bed, features that are common in the “basin-floor fans” in the North Sea. The parallel alignment of long axes of clasts with bedding planes (i.e., planar fabric) suggests laminar flow conditions typical of plastic debris flows. The sharp upper contact of the sandstone bed with overlying silty mudstone indicates freezing of the flow. See the related article by G. Shanmugam et al. beginning on p. 477 of this issue. Cliff photo by G. Shanmugam, Mobil R&D, Dallas, Texas, and T. Straume, Mobil Exploration Norway, Stavanger, Norway. Core photo by G. Shanmugam.