"Old Drift" and "Young Drift" are terms used in geology and geomorphology, particularly in the context of discussing river valleys and sediment deposition. 1. **Old Drift**: This term generally refers to older sediment deposits that have settled in a river valley over a longer geological time frame. These sediments are often more compacted and may have undergone significant weathering and soil development. They can contain fossilized remains and are typically associated with earlier stages of a river's history.
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