『Abstract
　Loesses form wide belts in front of previously glaciated areas. Their thicknesses may be considerable, changing in Eurasia from maximally a few metres in the west to a hundred metres or more in the east. The Eastern (particularly Chinese) loesses are mostly unrelated to glaciations. The periglacial loesses from China and elsewhere predominantly date from the last Pleistocene glaciation: relatively few comparable occurrences are known from earlier Quaternary glaciations. As it is difficult to imagine that the conditions in front of the land-ice masses during the earlier glaciations differed fundamentally from those of the last one, considerable quantities of loess must have disappeared. This disappearance, which is commonly ascribed to fluvial and eolian erosion, is not easily explained as equivalent deposits that nay have the older loesses as a source, are practically absent. A possible explanation might be that loess is recycled during successive glaciations. Some loess disappears during interglacials by erosion, but this quantity is more than compensated by the formation of new silt particles. The implication would be that the loess deposits increase in volume for each new glaciation.

Keywords: silt; periglacial processes; sediment recycling; sorting; eolian abrasion; glacial grinding』

1. Introduction
2. Loess formation, deposition and erosion
　2.1. Loess formation
　2.2. Hot deserts
　2.3. Cold areas
　2.4. Drowned source areas
　2.5. Glacial grinding
　2.6. Deposition of loess
　2.7. Erosion of loess
3. Recycled loesses
Acknowledgements
References

• Busacca,A.J., Beget（後ろのeの頭に´）,J.E., Markewich,H.W., Muhs,D.R., Lancaster,N. and Sweeney,M.R.(2004): Eolian sediments. In:Gillespie,A.R. and Porter,S.C. (Eds.), The Quaternary Period in the United States, Developments in Quaternary Science vol.1. Elsevier, Amsterdam, 275-309.
• Chan,M.A.(1999): Triassic loessite of North-Central Utah: stratigraphy, petrophysical character, and paleoclimate implications. Journal of Sedimentary Research, 69, 477-485.
• Johnson,S.Y.(1989): Significance of loessites in the Maroon Formation (Middle Pennsylvanian to Lower Permian), Eagle Basin, Northwest Colorado. Journal of Sedimentary Petrology, 59, 782-791.
• Pye,K.(1987): Aeolian Dust and Dust Deposits. Academic Press, London, 335pp.
• Pye,K.(1996): The nature, origin and accumulation of loess. Quaternary Science Reviews, 14, 653-667.
• Rozycki,S.Z.(1991): Loess and loess-like deposits. Ossolineum, Wroclaw, 187pp.
• Smalley,I. and Jary,Z.(2004): A random walk towards a definition of loess. New Zealand Soil News, 52, 142-146.
• Smalley,I. and Jary,Z.(2005): Where is the loess? (and why?). New Zealand Soil News, 53, 62-66.
• Tsoar,H. and Pye,K.(1987): Dust transport and the question of desert loess formation. Sedimentology, 34, 139-153.
• Wang,X., Peng,P.A. and Ding,Z.L.(2005): Black carbon records in Chinese Loess Plateau over the last two glacial cycles and implications for paleofires. Palaeogeography, Palaeoclimatology, Palaeoecology, 223, 9-19.