374 E. HUNTINGTON GLACIAL PERIOD IN NON-GLACIATED REGIONS 



sence of loiowledge, it is useless to carry the subject further. The point 

 to be emphasized is that the unconformity, with its accompanying fossil 

 stream channel and lake bluff, confirms the conclusion derived from a 

 study of the alternating lacustrine and non-lacustrine strata. The con- 

 clusion is that during recent geological times there have been important 



Unconformity, j^ 

 (4). 6 feet — Massive lacustrine 



clay weathering 

 (3) 3 feet — Keddlsh gray sand. 

 (2) 2 feet — Pink clay. 



(1) 7 feet — Reddish gray sand. 



(10) — —Pink beds. 

 (9) 4 feet — Banded red and green clay. 



(8) 6 feet — Solid pale green lacustrine clay. 

 (7> 1 foot — Yellow sandy clay with reeds. 

 (6) 6 feet — Alternating greenish sand and clay. 



[pink. 



(6) 10 feet — Gravel. 



FiGUEB 12. — Section in Valley 2% ililcs East of Clunilelik Spring. 

 South of old Lop-Nor. Scale : 1 inch ^ 25 feet. 



epochs of climatic change of which we obtain no hint from the study of 

 glacial phenomena. 



NUMBER OF CLIMATIC CYCLES IN THE PLEISTOCENE (PLIOCENE) STROPHE 



AT LOP 



The exact number of lacustral epochs recorded at Lop-Nor can not be 

 determined as yet. In figure 10 I have indicated 8, but other interpreta- 

 tions are possible. For instance, the epochs numbered I, II, and IV are 

 cacli doul:)le. On the other hand, many observers would interpret III and 



* — to lake. 



Red clay. 



Figure 13. — Cross-section of Eolian Mesa shotmiin Figure 2, Plate 36. 



Section is at right angles to old lalie shore, and lies near flg ires .S and 1), and at 

 about the level of 9b, between the 35- and llo-foot strands. 



IV as a single complex epoch. Thus the number of lacustrine epochs 

 shown in this particular section is at leg,st 7 and at most 11. The upper 

 lacustrine layer may possibly have been deposited at the time Avhen the 

 lake stood at the 115-foot level, but there is no certainty in this respect. 

 In like manner the two lacustrine layers next below, namely, numbers VI 

 and VII, may represent the 600- and 300-foot lakes respectively. If we 



