240 I Zl (QIDIDIEIN 
the lamination was apparently quite unlike that which results 
from sedimentation. To better ascertain the nature of this lami- 
nation a block of considerable size was detached and gently split 
by fracture along the planes of the lamine. Tomy astonishment 
it revealed a surface strongly reminding of some gently fluted 
Fic. 1.—Fluted shearing-planes in the loess in Pottawattamie county, lowa 
(slightly reduced). 
ice-scorings (See, Pic). leneplaceds the lower half of the 
block and took the bearings, south 60° west and north 60° east. 
Repeating the observation at several points along the embank- 
ment, I found the fluted ridges to pursue strictly the same trend 
at all places. I also noticed that this trend lay neither in the 
direction of a tangent nor of a radius to the periphery of the 
hill in which the excavation was made. 
