A horizontally bedded succession of thick, well sorted sands, containing moderately dipping layers between the flatlying upper and lower surfaces of each bed are called ________.

Question

Quizplus · Accepted Answer

The description matches that of cross-beds, which are formed by the migration of dunes, deltas, or migrating channels. Graded beds (B) are formed by turbidity currents and have a gradual change in grain size within the bed, but they do not have the dipping layers seen in cross-beds. Oscillation ripple marks (C) indicate reversing tidal currents, but they are not associated with well-sorted sands. Current ripple marks (D) are also associated with reversing currents or tides, but they do not have the dipping layers seen in cross-beds.

A Horizontally Bedded Succession of Thick, Well Sorted Sands, Containing