A. Wings Discoveries in Vermont Geology. 409 



The quartzyte is in most parts a little slaty in structure, and in 



limited jM-rtious ;i shining ^ravish-black slate. In places over it 



there are areas of sub-concentric conchoidal lami- n 



nation, looking somewhat as if examples of the " 



flow-and-plunge structure, but more probably a \^J 



. result of concretionary consolidation. Tothe'lat- jD 



ter cause I attributed some forms that looked ex- tegf 



ceedingly like casts of a Pleur»U»,t«ri„ and a amsl 

 Murchison ia, and of a v al ve of Orth is lyn .r. Ot hers 



of these imitative forms over the surface were J* 



semi-cylindrical and chambered, as if worn casta JJj 



of long crinoidal stems ; yet having the chambers WB 



too large and irregular for any known crinoidal K| 

 forms. A portion of one of them is here figured 



natural size; its total length was over ten inches. g* 



These simulations of Crinoids may also be due to J** 



a concentric structure in the slaty portion of the m>J 

 rock ; yet how, it is not easy to understand. 



1. Eastern portion of the Eolian Limestone belt, and the Q'nirfzyf-:. 

 adjoining. 



In this eastern portion of the Eolian limestone, constitut- 

 ing one-fourth to one-third of the whole breadth, no fossils 

 have been found. The more orj of the rock 



accounts for the absence of fossils. Conclusions as to its age 

 and that of the quartzyte have to be based on other consid- 

 erations. Till- cu.lei..',' ■■!' intenser metamorphism on going 

 eastward is apparent beyond the limits of the limestone region, 

 to and bey e ktain axis, 



The interstratifieation of the quartzyte and Eolian limestone 

 is illustrated in the section given on page 340, in which two 

 bands of dolomite are included between belts of the quartzyte. 



In July, 1875, Mr. Wing made, along with Professor Seelj, 

 a special examination of the quartzyte mountain called the 

 "Hogback," forming the northern terminus of the Vermont 

 Quartzyte range, and lying near the western foot of the Green 

 Mountains. At the north end of the Hogback a low hill, situ- 

 ated north of the road to Starksboro, is of hard gravis i quartz- 

 yte, while the main range south is brownish and i 

 stratified, with the dip 70° to 75° to the eastward. North of 

 this low quartzyte hill, the quartzyte extends on northward in 

 narrow masses,' and is directly overlaid on the northeast by 

 dolomite and bounded by the same dolomite around the whole 

 northern end. The dolomite on the west was not seen in 

 immediate contact with the quartzyte; but at the nearest 

 point, "some rods distant," it seemed to dip east at a higti 

 angle, while a few rods to the west it had i 

 dip. On the east side of the quartzyte at this northern end of 



