Eolian activity had begun in the Ferris-Lost Soldier area by at least ca. 9,950 to 10,330 years b.p. Major depositional intervals (indicating widespread Ferris dune activity) correlate with two radiocarbon-dated periods of drought. The first
occurred between ca. 7,660 and 6,460 years b.p.| the second occurred following ca. 6,460 years b.p. (and lasted until ca. 5,500 years b.p.). Since the last major depositional (drought) interval, the climate in the Ferris-Lost Soldier area has moderated
of soil series such as textural composition, organic carbon, calcium carbonate and hydrated ferri-oxyde-content, Cation Exchange Capacity (CEC), soil water retention and hydraulic conductivity. Necessary input for the system are the soil series and some
PLAGIOCLASES, PUIS DES ELEMENTS QUELQUE PEU PLUS RESISTANTS, TELS QUE LE MICROCLINE ET LA BIOTITE. DANS LA PARTIE SUPERIEURE DU SAPROLITE UN RE-ARRANGEMENT DES MATERIAUX DE TRANSFORMATION A LIEU, ET DES ARGILLANES ET FERRI-ARGILLANES SONT SOUVENT OBSERVEES| CES