Delta
I'm guessing you mean sand dunes.
You can notice sandbanks along many high tide bodies of water. These are formations that feature long wavelike patterns in the sand. Sandbanks are formed when sediments are deposited by waves and tides.
If a rock has ripples pointing downward, it suggests that the rock was formed in a depositional environment where sediments settled or were deposited horizontally or at a slight angle downward. This can occur in environments like riverbeds, deltas, or beaches where sediments are being deposited and compacted over time.
Sediments are created by deposition.They may further consolidate into sedimentary rocks.
oh!!
sediments
sediments
A triangular-shaped feature of deposits at the mouths of many rivers is called a delta. It usually is in the shape of what is called an alluvial fan.
a moraine
This is known as a terminal moraine.
a sand dune...
The Feature was created in 2008.