Imbrication (sedimentology) sedimentology imbrication refers to a primary depositional fabric consisting of a preferred orientation of clasts such that they overlap one another in a consistent fashion , rather like a run of toppled dominoes . Imbrication is observed in conglomerates and some volcaniclastic deposits .Types A-axis imbrication where the long axes of the clasts are oriented parallel to the flow direction . This fabric is characteristic of clasts carried in suspension and this is only preserved in the case of a fast-waning flow in which the clasts are deposited without any significant rolling . This fabric is typical of conglomerates at the base of turbidite beds but is also occasionally observed in alluvial fan deposits reworked by flash floods AB-plane imbrication where the long axes of the clasts are oriented perpendicular to the flow direction and the imbrication is of the flattened AB plane , with the intermediate axes in the flow direction. This fabric is characteristic of clasts carried as bedload . This imbrication forms as the clasts are rolled along the base of a channel. The flat clasts roll onto those downstream and come to rest with their downstream end propped up by the downstream pebbles and can be used to diagnose original flow directions . long axis aligned with paleocurrent, and dipping basinward in glacial sediments, whereas deltaic gravels may be oppositely inclined.
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