ABSTRACT

Continuing studies of high-resolution dipmeter data suggest that dipmeter patterns can be used to identify at least three different major depositional environments. Dipmeter patterns differentiate sediments deposited (1) in the neritic environment between beaches and the seaward edge of the continental shelf, (2) on the slope between the outer edge of the shelf and the abyssal zone, and (3) near active deltas where distributary front sands may accumulate.

Distributary front sands tend to be deposited in one of three general shapes: (1) elongate, (2) crescent, or (3) fan. Dipmeter patterns in distributary front deposits are manily influenced by current-induced cross-stratification rather than structural dips. These "current patterns" record the dip of foreset beds, giving a characteristic dip pattern that can be readily identified. The direction of dip in these current patterns defines the direction of transport, and the magnitude of the dip indicates the probable shape of the sand body.