Possible Continuous-Type (Unconventional) Gas Accumulation in Lower Silurian "Clinton" Sands, Medina Group, and the Tuscarora Sandstone in the Appalachian Basin: A Progress Report of 1995 project activities

Robert T. Ryder, Kerry L. Aggen, Robert D. Hettinger, Ben E. Law, John J. Miller, Vito F. Nuccio, William J. Perry, Jr., Stephen E. Prensky, John R. SanFilipo, and Craig J. Wandrey

Open-File Report 96-42

Figure 5. Shoreface stacking patterns in the Medina Group along transect B-B'. Progradational shoreface parasequences are interpreted from natural-gamma logs that show coarsening upward successions and laterally continuous sandstones that fine in a seaward direction. Retrogradational shoreface stacking patterns are interpreted in the lower part of the Medina Group from laterally continuous successions that fine upward from sandstone to siltstone and mudrock. Fluvial and tidal deposits are interpreted from serrated log signatures that show thin and fining or coarsening upwards stratal successions with limited latteral continuity. Shoreface, tidal, and fluvial interpretations are also based on sedimentological descriptions of coeval strata by Brett and others (1990, 1995) and Laughrey (1984). Lateral variations in the thickness of sandstones in the uppermost part of the progradational deposit suggest an unconformable contact with overlying fluvial and tidal rocks.

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