THE NORMAL CURVE 59 



6801-6903. — Continued 



3 inches (38 cm.); and 1 foot 5% inches (45 cm.) 

 respectively. Varve 6806, accordingly, does not 

 represent drainage at locality 67. 

 6855 is sandy and marks a drainage. 

 6903 is relatively much thicker at point 63 (dashed line) 

 than at 67 (full line), indicating a drainage from one 

 of the side valleys. 



6904-7000.— Fairly good. The two curves (both, "19 Vt.-N. H.") 

 correspond rather well. 



At locality 63 these varves are silty to sandy 

 with very thin winter layers. The different meas- 

 urements agree well; this horizon is much better 

 than the series 6801-6903. Some varves, particu- 

 larly 6928, 6936, 6937, and 6946, are a little too 

 thick. Varve 6997 marks a considerable drainage 

 which originated above locality 67. 



In the Woodsville district (lower curve) there 

 occurred two marked drainages, viz. in 6915- 

 6917 and 6941-6944. The layers consist of silt. 

 Furthermore, some varves, e. g. 6949 and 6973, 

 are somewhat too thick. The fact that these 

 drainages, as well as that during year 7007, are 

 not recorded below locality 68 seems to indicate 

 that there was here a barrier high enough to 

 prevent the suspended material from getting across. 



7001-7073. — The correspondence between the two curves (both, 

 "20 Vt.-N. H. w ) is not good. At locality 63 the sedi- 

 ments consist of silt to sand and probably were 

 deposited in very shallow water. Accordingly the 

 thicknesses of the varves are not reliable. The 

 lower curve, based on the measurements in the 

 Woodsville district, except for some drainages, is 

 good. The different measurements show good 

 agreement. 

 7007 is sandy and, at localities 79, 80, and 82, measures 



