The Correlation of Weathered Transported Soils

At the meeting of this Association a year ago, a question was asked re' garding the correlation of bottom land soils which had been reclaimed and protected from overflow by the construction of levees; the question indicating'. the possible feeling that such soils being no longersubject to periodic inundation, should conceivably be classed in a different soil province as "terrace" soils. In our western surveys we have to do a great deal of work on transported soils. In fact by far the major part of the soils possible of agricultural development lying west of the Great Plains are made up of soils that have been transported by wind or water. In California over 75 per cent of the arable land of the state has been covered by detailed or reconnoissance surveys. Of the 25,700,000 acres on which the measurements of the soil areas have been' completed and tabulated, we find that about 5 million acres are classed as non-agricultural (rough mountainous land, riverwash, etc»), about 4 million acres are residual soils, over 300,000 acres are peat and muck, and over 3.5 million acres are transported soils. Of the latter, about 6,600,000 acres are "Recent Alluvial", over 5OO,OOO acres are "Aeolian" or wind-transported soils, about 8OO,OOO acres are "Lacustrine"' or lake-laid soils and over 7 .million 'acres. are "Old'Transported" or "Old Valley-filling" soils, these latter being com' parable to the "Terrace" soils of the east. In other western states the relative importance of the transported soils would be about the same as in California.