appendix: review and critique 473 



glacial drift, with the marine shorelines of the sea into which the streams 

 from these plains discharged. Deperet first conceived this method while 

 studying the features around Lyons. He there found > as indicated in his 

 paper of May 5, 1919 (1919.1), that the outer moraine connects with a 

 terrace 55 to 60 meters above the Rhone, while other moraines, which he 

 designated "Neorissian, 1 " connect with a terrace 30 meters above the 

 stream. This eventually led Deperet to conclude that the outer moraine 

 is of Mindel age and not a Kiss moraine, as classed by Penck, and that 

 his Neoriss is the true Eiss moraine. 



..(-2a). In opposition to Deperetfs view, Leverett points out that the 

 outer moraine in that part of France is well enough preserved to be 

 classed as Eiss moraine, and he regards Penck, instead of Deperet, as 

 correct. Penck,. no doubt, was familiar with all -the differences in the 

 heights of terraces connecting with the several moraines, and knew that 

 the inner ones were tied to a terrace 30 meters above the stream, and 

 the outer ones to a terrace 55-60 meters, and probably was able to explain 

 the reason for this difference when the difference in age is not very great. 

 Leverett has observed several cases of this sortj where inner moraines of 

 the last, or Wisconsin, stage of glaciation connect with a much lower 

 river terrace than do the outer moraines. This is notably true on the 

 Illinois Eiver, where the outer moraine has connection with a terrace 170 

 feet above the. river,. while moraines farther up, near Hennepin, connect 

 with a terrace 50 feet lower. At- the time these moraines were formed 

 the glacial drainage had cut down the part of the valley near the outer 

 moraine more than 50 feet, so there was a fall from Hennepin down the 

 valley through the outer moraine. In this case the material was sandy 

 gravel, which the glacial stream could easily remove. This may also be 

 the explanation in the case of the Ehone Valley terraces. 

 • ... (2b): More in detail, Leverett considers that the correlating of these 

 terraces on the Ehone near Lyons with marine shorelines that stand 

 precisely the same height above the sea-as these terraces do-above the Ehone 

 is a matter that would involve considerable field-work along the entire 

 interval from Lyons to the mouth of the stream. He is therefore inclined 

 to think that the lowering in the vicinity of Lyons, from the 55-60-meter 

 terrace down to that of 30 meters, is referable to a cutting away of some 

 sand and gravel deposits below Lyons, rather than to any effect which 

 the lowering of the Mediterranean might have had. This much is 

 certain : that the Ehone Valley was greatly filled by glacial deposits, so 

 it would not be surprising if some glacial deposit acted as a barrier to 

 hold the stream up to 55-60 meters. It may, therefore, have taken but 



