A complex system of sculpturing in limestone pebbles is referred to as a pattern of solution morel. It consists of ridges, grooves, pinnacles, truncated pinnacles, pinnacle caldrons, micronatural bridges, and other features.

The pattern is developed in pebbles that consist of impure limestone which had original convex surfaces. The sculpturing progresses through the stages of youth, maturity, and old age. These stages are recognized by the appearance of new forms and the destruction of old. The pebbles are part of the gravel in a terrace of Circle age from a semi-arid region.

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