187 



successive ridges two or three and in instances four. In still other places 

 the topography takes the form of dunes, low domes with no characteristic 

 order or grouping. The gradients of the ridges on the leeward or east side 

 if often remarkably steep. The height of the ridges is in a few cases as much 

 as twenty-five feet. In most instances the height is not more than half the 

 figure stated. An interesting observation is that the dunes and ridges extend 

 along the north sides of tributary valleys still keeping a north-south direction 

 in the ridges, which in some places are arranged in etehelon. This is noticed 

 on the north side of Honey creek. The surface on the north side of Otter 

 creek valley appears as one long wave after another, cloaking the bluff front 



Blake Hill. A sand dime north side National Road. 



and crest. This arrangement of ridges along the re-entrant valleys indicates 

 that the valleys were made before the deposits. The direction of the bluffs 

 has evidently influenced the deposition of the material as a section of the 

 river bluffs running directly east-west on the south side of Honey creek shows 

 no dunes or ridges. The deposits also show a marked relation to the terrace 

 area in the valley. Where a broad stretch of terrace lies below the bluffs 

 the ridges and dunes are more strongly developed. Where flood plains 

 approach the bluffs the deposits on the crest and bordering uplands decrease 

 or disappear. Conclusions as to the cause of the deposits and their source 

 seems to be amply justified by the evidence that the deposits are wind 



