Many researchers have concluded this sediment is actually loess , or wind-blown silt, which is mixed with some clay and sand.
Large areas of southern Arkansas are also covered by Pleistocene-era loess , with some deposits over 4 m thick.
No one told us how they were shaped as silt deposits, called loess , that blew in from the Missouri River floodplain, beginning about 30,000 years ago.
The thickest loess occurs in central China on the Loess Plateau, where it reaches a thickness of about 330 m near Lanzhou.
Companion studies of dust samples from the Sahara and the Saudi coast and loess from China show that the higher the calcium in the mineral, the more reactive they are in with nitric acid.
As a whole, the mineralization and nitrification of nitrogen in the manual loessial soil was higher than that in the red loessial soil.
Selecting soils from stable upland positions that developed in loessic parent material allowed us to isolate modern climate as the main influence on soil properties.
The south-eastern slope bears heavy loessic soil, mixed with superficial pebbles and compact loam soil.
Proper consideration should be given to zoning of areas of collapsible loessial soils.
Predicted yields for different terrains of the loessial soil showed that the soil in the plain lands and the table lands had a higher productivity than that of the slope lands and the terraces.