"The alluvial terrace
soils were degraded in a tropical climate for thousands of years.
The Upper Pleistocene alluvial terrace
deposits of the Quaternary alluvial sediments of the Alto Guadalquivir Basin (SE Spain) provide an excellent example of how geomorphological evolution can exert an important control on mineral and geochemical signatures of sediments in a tectonically active area (Baena 1993; Garcia-Tortosa et al., 2008).
The bedrock on dam site composes of sequences of marl, mudstone with reddish brown and gray sandstone with silty-marl and greenish silt related from upper red formation (URF), while the abutments covered with old alluvial terrace
. The stratification orientation is northwest-southwest.
Hence, isolated osteoderms are the most commonly collected remains of fossil armadillos, regardless of context (e.g., alluvial terrace
deposits, Slaughter 1959; cave sediments, Lundelius 1985; river gravel bars, Davis & Ball 1991; tar pits, Rincon et al.
Until Ruth Shady decided to investigate what lay beneath the massive piles of earth looming up on the alluvial terrace
bordering the Supe Valley, they had attracted little attention from archeologists.
The four basic soil formations within the area include: (1) Franciscan hills that form the southern and western boundaries, (2) the alluvial basin of High Valley, (3) the alluvial terrace
along the southeast boundary and (4) the volcanic ridges along the area's northeastern portion near Round Mountain.
For example, at Pasoh, Malaysia, Ashton (1976) found substantial soil heterogeneity within several plots that had been described by Wong and Whitmore (1970) as being located on single soil types; one, for example, extended from an alluvial terrace
onto an adjacent ascending slope.
-- Three valley fill and four alluvial terrace
units are recognized from Holocene and late Pleistocene sediments in the lower Nueces River valley where this river is entrenched in the late Pleistocene Beaumont Formation.
Pleistocene-Holocene Sakhi Sarwar Group represents Dada (conglomerate) and Sakhi Sarwar (clays, sandstone and conglomerates) formations; alluvial terraces
, fans and alluvial plains.
The alluvial terraces
deposited by Bou Hamdane and Seybous rivers constitute the quaternary cycle of the Guelma seismogenic basin.
One of the current projects, on the Akposso Plateau, is a search for diamonds, which have been recovered by small miners from the alluvial terraces
. The geotectonic setting, the Atacorian mobile belt, could suggest the presence of a diamond-lamproite association.