A delta is a feature of deposition, located at the mouth of the river as it enters a sea or a lake. Deposition occurs as the velocity and sediment-carrying capacity of the river decrease on entering a lake or sea
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Deltas for only when....
the rate of deposition exceeds the rate of sediment removal.
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Topset beds
The larger and heavier particles are the first to be deposited as the river loses its energy.
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Foreset beds
Medium graded particles travel a little further before they are deposited as steep-angled wedges.
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Bottomset beds
The very finest particles travel furthest into the lake before deposition and form the bottomset beds.
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Card 2
Front
Deltas for only when....
Back
the rate of deposition exceeds the rate of sediment removal.
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