392 THICKNESS. 



schists and grits. Add to those on the route of Section IX. in the middle of Hinesburgh , 

 beds of quartz rock. Along Winooski River the rock is conglomerate, interstratified with 

 talcose schists and grits. 



The following is the order of rocks along Winooski River, beginning at the bottom of 

 the series in Essex, and extending to the west part of Richmond : Talcose schist, con- 

 glomerate, with seams of green gritty slate, talcose schist, chlorite schist with quartz, 

 talcose schist with sandstone, talco-argillaceous slate, talcose schist and sandstones, talcose 

 schist, coarse conglomerates (typical locality), and talcose schists. 



Professor Thompson called these rocks Taconic, and has left the following notes con- 

 cerning them, as they occur in Chittenden County. " These rocks commence east of [the 

 clay (Georgia?) slate and Eolian limestones], and extend eastward ; but I shall not at- 

 tempt to assign their eastern limits. They consist in this country entirely of schistose 

 rocks, composed chiefly of quartz, and most of them are more or less magnesian. There 

 is a belt extending through West-ford and the east part of Essex and the west part of 

 Jericho to Winooski River, which is quite chloritic. This is often thick-bedded, and 

 answers very well for a building stone, though rather soft. It has been considerably 

 used for doorsteps, and has been transported -to Burlington for that purpose. Some of 

 the strata appear to be a coarse sandstone, or rather a fine conglomerate. Some places, 

 as at Essex, exhibit a fine compact magnesian slate, which is easily sawed into any form, 

 and is used as a fire-stone. In many places the slaty laminae are covered with a fine talc 

 glazing. The slate generally, in the eastern part of the county, may perhaps be called 

 talcose, but the proportion of talc in the greater part of it is quite small. The predomi- 

 nant mineral in it. is quartz, and it often occurs, either white or limpid in seams several 

 inches in thickness." 



The following is the order of the members of this belt of rocks between Georgia depot 

 and East Fairfax : Gritty greenish slate, quartz rock, gritty greenish slate, quartzite, 

 conglomerate, quartz rock, talcose. sandstones, talcose schists and sandstones, talcose sand- 

 stones, coarse conglomerates, and finally talcose grits and sandstones. 



The following is the order of the members of this belt of rocks four miles further north, 

 but the section does not extend further east than the sixth member of the previous sec- 

 tion : Silicious limestone, quartz rock, talcose schist, coarse talcose conglomerate, talcose 

 schists. This conglomerate is what is described as the very fine ledge in North Fairfax. 

 The first three members of this group in the east part of St. Albans are slaty quartz rock, 

 compact dun-colored quartz rock, checkered with white veins and talcose grits. 



A spur runs down to Milton from Georgia depot, composed, as far as Milton Falls, of 

 quartz rock and dolomite. The northwest side of Snake Hill, in Milton, as well as its 

 southeast side, is made up of quartz rock and sandstone. The top of the hill is sandstone, 

 occasionally slaty, mixed with layers possessing the variegated colors of the Winooski 

 marble. Southwest of Milton Falls the calcareous and magnesian rocks prevail. At 

 Georgia depot the rock is quartz, succeeded on the northeast by mica schists. Near the 

 corner of the four towns, Fairfax, Georgia, Fairfield, and St. Albans, there is an impure 

 limestone interstratified with quartz rock. The underlying portion of the quartz runs off 

 to St. Albans like an arm, through Prospect Hill and Aldis Hill, terminating in the 

 midst of a clay slate, which is almost a black sandstone. The overlying portion of the 



