Page:The Journal of geology (IA journalofgeology21894univers).pdf/440

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 conglomerate 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 clastics 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 Furnace, Plymouth, Vt. Size of block photographed 13 x 8 inches.

Much more interest was felt in 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-