It is unusual to see all of a complete Bouma cycle, as successive turbidity currents may erode the unconsolidated upper sequences.
2.
Bouma cycles begin with an erosional contact of a coarse lower bed of pebble to granule conglomerate in a sandy matrix, and grade up through coarse then medium plane parallel sandstone; through cross-bedded sandstone; rippled cross-bedded sand / silty sand, and finally laminar siltstone and shale.
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