A. Wing's Discoveries in Vermont Geology. 

 chloritic), or a hydromicaceous quartzyte or c 



In Sunderland the quart lies, with quartzyte, tai- 



cose schist [that is, hydromica slate] (p. 614). In Wallingford the 

 quartzyte and quartz conglomerate are interstratified with talcose 



t (p. 627). "Talcose schist is associated with the quartz-r< 

 of Mendon" (p. 634). In Goshen "the quartz rock formation is 

 composed of hyaline quartz, talcose schist, and argillo-talcose 

 schist" (p. 640). In Ripton " the quartz-rock is composed of ten 

 bands of different rocks, viz: hyaline quartz, compact sandstone, 

 talcose and chlorite schist " (p. 645). Speaking of the belt of" tal- 

 cose conglomerate" it says that it includes sandstones, breccias, 

 quartzyte, coarse conglomerates, talcose schist, novaculi 

 and "talcose schist is the most common rock in the belt" 

 (pp. 386, 387). 



I have examined this association of hydromica slate and 

 quartzyte in the quartzyte ridge northeast of Rutland (the ridge 

 making the western boundary of the town of Mendon). Having 

 on my second visit struck the ridge at a different point from that 

 examined on my first visit, I was perplexed by finding hydromica 

 slate in place of true quartzyte ; but afterward reached an ex- 

 planation on observing the gradations of one rock into the other. 

 The Geological Chart of the Vermont Report does not generally 

 represent this interstratification of the quartz and hydromica slate, 

 as the Report observe* oil were not separately 



made out owing to the intimate relations of the two. It is shown, 

 however, in Section VIII, where, near Ripton, occurs ti 

 " Quartz rock interstratified with talcose schist ;" and bands of 

 color in the colored section represent the fact. 



8. " Great Fault of Western Vermont:' 

 Snalce Mountain is a north-and-south ridge of Red Sand-rock 

 several miles long, situated to the west of Middlebury, within 

 seven miles of Lake Champlain. It has a steep western face, 

 and gradual eastern slopes — the former across the str; 

 and the latter nearly conforming with it. This western side is 

 the course of a great fault. 



The rock of Snake Mountain east of the fault is the Red 

 Sand-rock of the Vermont Report, and this continues to be the 

 surface rock eastward to Otter Creek. At the southern ex- 

 tremity of the mountain, in Bridport, west of the mountain, 

 there are the successive Lower Silurian formations, but in an 

 inverted position. The following section gives the order and 

 position of the beds observed at this place. 



The first and uppermost rock west of the fault containing 

 fossils is the Chazy ; below this comes the Trenton, and next the 

 Hudson River, so that the Chazy and Trenton have been folded 



