424 



THE JOURNAL OF GEOLOGY. 



In Rhode Island the Newport conglomerate with its indented 

 and elongated pebbles was a starting point in the series of changes 

 from an unchanged conglomerate to a gneiss, the Wallingford con- 

 glomerate being an intermediate stage of metamorphism, while 

 the Plymouth occurrence represented the completed alteration. 



Fig. 2. Longitudinal cross-section of stretched conglomerate-gneiss. The 

 pebbles in the upper half of the figure are mainly gneiss. In the longest pebble near 

 the center the original lamination can still be made out. The more feldspathic elastics 

 are now seen as thin linear films of crushed quartz and feldspar between more 

 resistant pebbles of quartz and quartzose gneiss. From Edward Hitchcock's Green 

 Mountain locality, one mile north of Tyson's P'urnace, Plymouth, Vt. Size of block 

 photographed 13x8 inches. 



Much more interest was felt m this last-discovered locality where 

 gneissic and quartz pebbles are flattened and pulled out into 

 alternating, non-persistent bands of these minerals in a highly 

 sugared condition, but still clearly possessing their deformed 

 clastic outlines. Although not directly pertinent to the subject 

 of this paper, it seems desirable to reproduce here a photograph 

 of a block of this conglomerate, cut in longitudinal cross-sec- 



