The mineralogy of soils involved in mass movement in Oregon's
coast range was examined to determine relationships between clay mineralogy
and landscape instability. The objectives were: 1) to determine
what kind of materials constitute the less than 2μ fraction of soils involved
in different categories of mass movement, and 2)...
Clay mineral genesis was studied in soils representative of several
different geomorphic surfaces in western Oregon, ranging in age from
Pliocene-early Pleistocene to late Pleistocene. Soil solution studies,
clay mineralogy, and soil raicromorphology were employed to provide
evidence of clay mineral synthesis and interpret soil genesis.
Soils at each study...