Two contiguous alluvial valleys (Maria and Guadalupe sectors) of the upper Guadalentín River (SE Spain) show distinct Holocene alluvial architecture (cut-and-fill, nested and stepped fill terraces), revealing a strong control of valley morphology and bedrock barriers on sediment delivery, storage and preservation. The headwater valley (Maria sector) preserves four morphosedimentary alluvial units corresponding to two palaeogeographic stages. Morphosedimentary unit (MSU1), the most extensive, is a major depositional valley infill dominated by sand and silt texture, showing three stratigraphic sets dated 9000–8500, 5300–4800, 4000–3000 cal BP. This vertically stacked alluvial accumulation occurs upstream of a narrow bedrock channel, that limited sediment connectivity with the downstream Guadalupe sector. Between 3000 and 2350 cal BP, a 15-m deep incision on MSU1 occurred, and subsequent cut-and-fill cycles generated three alluvial terraces dated at 2350–1900 cal BP (MSU2), 1800–700 cal BP (MSU3), and post-400 years (MSU4). In the downstream valley (Guadalupe sector), six flights of alluvial terraces (MSUg1 to MSUg6) were formed by episodic aggradation and quasi-continuous incision, in response to baselevel changes of the lower Guadalentín River during the Holocene. Alluvial chronologies in these two contiguous valleys show out-of-phase sedimentation periods under low connectivity conditions (9–3 ka), and in-phase cut-and-fill cycles after valley re-connection (post-3.0 ka). The late Holocene alluvial activity periods also coincide with morpho-stratigraphic data from the lower Guadalentín, indicating that fluvial connectivity throughout the catchment was only completed in the late Holocene.

瓜达伦丁河上游（西班牙东南部）的两个连续冲积山谷（玛丽亚和瓜达卢佩河段）显示出全新世的冲积构造（挖填，嵌套和阶梯状充填阶地），揭示了对山谷形态和沉积物基岩屏障的强力控制交付，存储和保存。源头河谷（Maria区）保留了四个形态沉积冲积单元，分别对应于两个古地理阶段。形态沉积单元（MSU1）是分布最广的主要沉积谷填充物，以砂和粉砂质感为主，显示了三个地层组，日期为9000-8500、5300-4800、4000-3000 cal BP。这种垂直堆积的冲积作用发生在狭窄的基岩河道的上游，从而限制了沉积物与下游瓜达卢佩河段的连通性。在3000至2350 cal BP之间，在MSU1上发生了15米深的切口，随后的充填循环产生了三个冲积阶地，日期分别为2350–1900 cal BP（MSU2），1800–700 cal BP（MSU3）和400年后（MSU4） 。在下游河谷（瓜达卢佩河段），新世时期，由于瓜达伦河下游的基准面变化，通过间歇性沉积和准连续切口形成了六个冲积阶地（MSUg1至MSUg6）。这两个连续山谷的冲积年代学显示，在低连通性条件下（9–3 ka），相沉积期为异相，在山谷重新连接后（3.0 ka之后），相填挖和充填周期也出现了。全新世晚期冲积活动期也与来自瓜达伦丁下层的地层学数据相吻合，