The rock lithology varies from Permian to Upper Cretaceous-fractured Hawasina Complex and Semail Ophiolites in Masfut, Quaternary eolian sand
in Manama and Quaternary sand dunes in Ajman city.
There are two narrow west-east trending fields of eolian sand dunes overlying the formation, and much of the southern region of the AVA is generally overlaid with upper Quaternary sand sheet deposits (Holliday 2001).
The Escondido Valley AVA lies within a transition zone between the southern extent of Quaternary, alluvial eolian sand, silt, clay, gravel and carbonate deposits common to the High Plains, and the western extent of the Cretaceous Edwards Limestone (Fig.
Sand barrens are located on eolian sand
deposits and are mostly positioned on the leeward side of the river.
Holliday VT, Rawling JE (2006) Soil-geomorphic relations of lamellae in eolian sand
on the High Plains of Texas and New Mexico.
Contemporary and historical rates of eolian sand
transport in the Indiana dunes area of southern Lake Michigan.
However, it is not known whether this eolian sand is the same age as Unit VI.
Desiccation and in-filling hypothesis: The third hypothesis relies on drying and cracking, followed by in-filling with eolian sand at a later date.
Based largely on grain size distribution, we interpret the material that buries the basal soil as eolian sand
in the uppermost mud is variable, and occasional bands of sand may relate to when the dunes lost their wooded cover -400 yr.
The basal buried soil in these dunes is developed on lake plain sediments and buried by eolian sand
from adjacent cotton (Gossypium hirsutum) fields occurred along the east, south, and west perimeters of the site.