Hi, I'm studying some Upper Devonian conglomerates in SW New York (Rock City State Forest) with very interesting x-bedding and channel deposits, likely a high-energy macro-tidal environment. Rare bedding plane exposures have show some strange elongate structures (up to 12" long, replaced by hematite, fossil/organic or inorganic?) in close association with large clasts (2-3" ellipsoidal milky vein quartz); both parallel with bedding but with some linear alignment (possible transgressive lag deposit?). Any ideas on the photos below? Thanks for any input. - Jim