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Late Holocene Alluviation in the Palomas Basin, South-Central New Mexico

The origins of late Holocene alluvial deposits in the American Southwest have long been debated, with climate variability being the most commonly hypothesized driver of episodic valley-fill aggradation and incision. Deposits that are correlative over multiple drainage basins are thought to form by alluviation occurring in drier periods with infrequent floods. Conversely, larger and/or more common flood events during wetter intervals permit streams to incise their valley bottoms. Such shifts between aggradation and incision have resulted in both deeply cut arroyos and low-lying alluvial benches over the past ~4000 yr or longer.