370 F. H. Lahee — Metamorphism and Geological Structure. 



Pitch. — The stage of metamorphisni has no bearing upon 

 the direction of pitch. It is usually high in regions where the 

 pitch is steep, and may be high where pitch is low. 



Axial planes. — The intensity of metamorphism is unre- 

 lated to the direction of dip of the axial planes. 



Relative number of folds across the Basin. — In treating 

 this subject, we concluded " that the number of principal folds 

 per unit of Basin width, and therefore the degree of compres- 

 sion, regularly increases southward."* As regards the geo- 

 graphic distribution of the degrees of metamorphism, we stated 

 " that the degree of metamorphism in the southern half of the 

 Basin increases westward and southward" (seep. 15). Clearly, 

 here is concordance of phenomena. 



Minor folding. — Below are listed the localities of contor- 

 tionf in an order such as to emphasize their positions in the 

 major folds and to bring out the relations between the degrees 

 of metamorphism and the amount of contortion : 



Stages of metamor- 



Position in Locality Metamorphism phism in hand- Degree of 



fold number in general specimens contortion 



Cg. Ss. Sh. 



In axial 4 Moderate __ __ __J Moderate 



regions of 16 High CDC Considerable 



anticlines 27 " D .. C High 



33 Considerable C C C " 



Situated on 10 High .. D __ Considerable 



limbs of 14 " _. _. I) High 



folds 15 " __ D D 



20 D _. D " 

 48 " " 



Position in 1 High . . . . . . High 



folds 5 Slight _. .. .. Slight 



uncertain 6 Low __ B A Considerable 



V High _. D C 



11 D D .. 



12 " .. D .. 



13 " .. D .. 



18 .. __ C 



19 " .. .. __ 



21 " ______ 



22 " __ __ D " 



25 " ______ 



26 " __ __ D " 

 29 Considerable __ ._ __ " 



* See this Journal, last number, p. 259. f Ibid. , p. 259. 



X Wherever there is no record in this column, the data were obtained in 

 the field only. 



