A delta fan made of eroded red ash sediment occurs at the mouth of Keyser Creek.
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Kholm is an ancient town located on the fertile, inland delta fan of the Khulm River ( Darya-i-Tashqurghan ).
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Other Mars experts said the finding makes a significant contribution to the continuing debate among scientists about how much water there was on Mars, where did it go and how did the planet's intricate patterns of river beds, carved canyons and delta fans form without huge volumes of flowing water.
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