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



Localities 4, 16, 27, and 33 are near the axial regions of 

 major folds (all pinched anticlines) ; 10, 14, 15, 20, and 48 are 

 on the limbs of major folds ; and the others cannot be surely 

 placed in this respect. Evidently, then, there is no hard and 

 fast rule for the location of contortion in the larger folds. 



If the map be divided into four equal rectangles (by lines in 

 F and in 8 of the coordinate squares, tig. 1), three of the locali- 

 ties of contortion will be included in the northeastern area ; 

 live in the northwestern ; eleven in the southeastern ; and fif- 

 teen in the southwestern. That is, more contortion is found 

 southward and westward in the Basin." 



In five of the localities the contortion affects shale, sandstone, 

 and conglomerate, or sandstone and conglomerate ; in twenty- 

 nine it affects shale and sandstone — usually fine — or shale alone. 

 According to this, contortion is limited chiefly to the elastics of 

 finer texture (see p. 254). 



Areal distribution of variations in the major and minor 

 folding. — Taking into consideration both dip and strike of 

 major and minor folding, we could show that, if we should 

 pass across certain regions in the Basin, the complexity of the 

 deformation would increase. Thus, there is evidence for an 

 increase in the complexity of folding, 



(1) westward, in East Providence (D-E : 1-2) ; 



(2) eastward and westward from the middle of the western 

 coast belt, north of East Greenwich ; 



(3) southward, in Warwick Neck ; 



(4) westward, in the western coast belt, between East Green- 

 wich and Wickf ord ; 



(5) southward, in the western coast belt, south of East 

 Greenwich ; 



(6) eastward, in Prudence Island ; 



(7) westward, from Prudence Island to Hope Island ; 



(8) eastward, in northern Conanicut Island ; 



(9) westward, from southern Conanicut Island to the western 

 coast belt ; 



(10) southward, on Aquidneck Island ; 



(11) eastward, in northern Aquidneck Island ; 



(12) eastward, from Aquidneck Island to the eastern coast 

 belt; 



(13) westward, from middle Aquidneck Island to eastern 

 Prudence Island, Coddington Point, and Coaster's Harbor 

 Island ; and 



(14) southward, in Swansea. 



Obviously there is not uniform increase in complexity from 



* This relation is not due essentially to a greater number of outcrops in 

 the southern district. 



