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Alluvium refers to clay, silt, sand, gravel, or similar detrital material deposited by running water. New alluvium are these sediments that are being deposited right now and older alluvium refers to sediments that were deposited a short while before the new alluvium. For example, a 500 years ago some sediments were deposited in a stream bed and last year more sediments were deposited in that same stream bed. The 500 year old sediment would be older alluvium and the 1 year old sediment would be the younger alluvium.

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12y ago
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5mo ago

Old alluvium is deposited in ancient times and has undergone significant weathering and erosion processes, while new alluvium is freshly deposited and has not been weathered as extensively. Old alluvium may be more consolidated and contain more minerals, whereas new alluvium is typically unconsolidated and may contain more organic material.

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Q: What is the difference between old alluvium and new alluvium?
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